[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"minerals:one:1258":3},{"id":4,"longid":5,"guid":6,"name":7,"shortcode_ima":8,"entrytype":9,"entrytype_text":10,"varietyof":11,"synid":8,"polytypeof":8,"groupid":8,"weighting":12,"nolocadd":13,"blacklisted":13,"mindat_formula":14,"mindat_formula_note":8,"ima_formula":8,"elements":15,"sigelements":20,"key_elements":8,"impurities":8,"cim":8,"ima_status":8,"ima_notes":8,"ima_history":8,"approval_year":8,"publication_year":8,"discovery_year":8,"strunz10ed1":21,"strunz10ed2":21,"strunz10ed3":21,"strunz10ed4":8,"dana8ed1":21,"dana8ed2":21,"dana8ed3":21,"dana8ed4":21,"csystem":8,"cclass":8,"spacegroup":8,"spacegroupset":21,"a":8,"b":8,"c":8,"alpha":8,"beta":8,"gamma":8,"aerror":8,"berror":8,"cerror":8,"alphaerror":8,"betaerror":8,"gammaerror":8,"va3":8,"z":8,"csmetamict":13,"commentcrystal":8,"twinning":8,"tranglide":8,"parting":8,"epitaxidescription":8,"morphology":22,"tlform":8,"hmin":8,"hmax":8,"hardtype":8,"vhnmin":21,"vhnmax":21,"vhnerror":8,"vhng":8,"vhns":8,"commenthard":8,"dmeas":21,"dmeas2":21,"dcalc":21,"dmeaserror":8,"dcalcerror":8,"commentdense":8,"lustre":8,"lustretype":8,"commentluster":8,"diapheny":8,"streak":8,"colour":8,"commentcolor":8,"colors":8,"streak_colors":8,"luminescence":8,"uv":8,"cleavage":8,"cleavagetype":8,"fracturetype":8,"tenacity":8,"commentbreak":8,"opticaltype":8,"opticalsign":8,"opticalalpha":8,"opticalalpha2":21,"opticalalphaerror":8,"opticalbeta":8,"opticalbeta2":21,"opticalbetaerror":8,"opticalgamma":8,"opticalgamma2":21,"opticalgammaerror":8,"opticalomega":8,"opticalomega2":21,"opticalomegaerror":8,"opticalepsilon":8,"opticalepsilon2":21,"opticalepsilonerror":8,"opticaln":8,"opticaln2":8,"opticalnerror":8,"optical2vcalc":8,"optical2vcalc2":8,"optical2vcalcerror":8,"optical2vmeasured":8,"optical2vmeasured2":8,"optical2vmeasurederror":8,"rimin":8,"rimax":8,"opticaldispersion":8,"opticalpleochroism":8,"opticalpleochorismdesc":8,"opticalbirefringence":8,"opticalcomments":8,"opticalcolour":8,"opticalinternal":8,"opticaltropic":8,"opticalanisotropism":8,"opticalbireflectance":8,"opticalextinction":8,"opticalr":8,"specdispm":8,"ir":8,"electrical":8,"magnetism":8,"thermalbehaviour":8,"other":8,"industrial":8,"occurrence":8,"otheroccurrence":8,"type_specimen_store":8,"description_short":8,"aboutname":23,"rock_parent":8,"rock_parent2":8,"rock_root":24,"rock_bgs_code":8,"meteoritical_code":8,"updttime":25,"reviewed_at":8,"variety_of":26,"varieties":35,"group_members":36,"associates":37,"confused_with":38,"type_localities":39,"occurrence_total":40,"citations":41,"images":95,"structures":360,"synonyms":361,"language_names":362,"wikidata_qid":8,"texts":363},1258,"1:1:1258:0","22eb6b56-c719-43b7-b8c4-39abdc7e380a","Demantoid",null,2,"variety",223,10917,false,"Ca\u003Csub>3\u003C\u002Fsub>Fe\u003Csup>3+\u003C\u002Fsup>\u003Csub>2\u003C\u002Fsub>(SiO\u003Csub>4\u003C\u002Fsub>)\u003Csub>3\u003C\u002Fsub>",[16,17,18,19],"Ca","Fe","Si","O",[16,17,18,19],"0","spherical aggregates","Named by Nils Gustaf Nordenskiøld from the archaic German word \"Demant\" which means \"diamond\", in allusion to its very high brilliance resembling that of diamond.",0,"2026-04-12 18:11:22",{"id":11,"name":27,"entrytype":24,"csystem":28,"ima_formula":14,"mindat_formula":14,"hmin":29,"hmax":30,"dmeas":31,"dcalc":32,"strunz10ed1":33,"primary_image_id":34},"Andradite","Isometric",6.5,7,"3.8","3.859","9",1388,[],[],[],[],[],44,[42,47,51,56,61,65,70,75,80,85,90],{"id":43,"year":44,"html":45,"doi":46},430338,1878,"Waller, J. (1878) Analys af Demantoid från Ural. \u003Ci>Geologiska Föreningen i Stockholm Förhandlingar\u003C\u002Fi>,  4 (6) 184-187 \u003Ca target='_blank' href='https:\u002F\u002Fdoi.org\u002F10.1080\u002F11035897809446241'>doi:10.1080\u002F11035897809446241\u003C\u002Fa>","10.1080\u002F11035897809446241",{"id":48,"year":49,"html":50,"doi":8},17201396,1979,"Rost, F., Fuchs, B., Saddredini, H. (1979) Über Demantoid aus dem Ural und seine Farbe. \u003Ci>Der Aufschluss\u003C\u002Fi>,  30 (2) 51-56",{"id":52,"year":53,"html":54,"doi":55},673914,1986,"Guobin, Liu, Xu, Kang, Lin, Zhang (1986) On the genesis of demantoid from Xinjiang, China. \u003Ci>Chinese Journal of Geochemistry\u003C\u002Fi>,  5 (4) 381-390 \u003Ca target='_blank' href='https:\u002F\u002Fdoi.org\u002F10.1007\u002Fbf02866713'>doi:10.1007\u002Fbf02866713\u003C\u002Fa>","10.1007\u002Fbf02866713",{"id":57,"year":58,"html":59,"doi":60},531587,1996,"Phillips, Wm. Revell, Talantsev, Anatoly S. (1996) Russian Demantoid, Czar of the Garnet Family. \u003Ci>Gems & Gemology\u003C\u002Fi>,  32 (2) 100-111 \u003Ca target='_blank' href='https:\u002F\u002Fdoi.org\u002F10.5741\u002Fgems.32.2.100'>doi:10.5741\u002Fgems.32.2.100\u003C\u002Fa>","10.5741\u002Fgems.32.2.100",{"id":62,"year":63,"html":64,"doi":8},16529794,2010,"Praszkier, T., Gajowniczek, J. (2010) Demantoide aus Antetezambato auf Madagaskar. \u003Ci>Mineralien-Welt\u003C\u002Fi>,  21 (1). 32-41",{"id":66,"year":67,"html":68,"doi":69},1081801,2015,"Adamo, Ilaria (2015) Demantoid from Balochistan, Pakistan: Gemmological and Mineralogical Characterization. \u003Ci>The Journal of Gemmology\u003C\u002Fi>,  34 (5) 428-433 \u003Ca target='_blank' href='https:\u002F\u002Fdoi.org\u002F10.15506\u002Fjog.2015.34.5.428'>doi:10.15506\u002Fjog.2015.34.5.428\u003C\u002Fa>","10.15506\u002Fjog.2015.34.5.428",{"id":71,"year":72,"html":73,"doi":74},13841503,2019,"Schwarzinger, Clemens (2019) Determination of demantoid garnet origin by chemical fingerprinting. \u003Ci>Monatshefte für Chemie - Chemical Monthly\u003C\u002Fi>, 150 (5) 907-912 \u003Ca target='_blank' href='https:\u002F\u002Fdoi.org\u002F10.1007\u002Fs00706-019-02409-3'>doi:10.1007\u002Fs00706-019-02409-3\u003C\u002Fa>","10.1007\u002Fs00706-019-02409-3",{"id":76,"year":77,"html":78,"doi":79},13422768,2020,"Bindereif, Stefan, Rüll, Felix, Schwarzinger, Stephan, Schwarzinger, Clemens (2020) Chemometric Modeling of Trace Element Data for Origin Determination of Demantoid Garnets. \u003Ci>Minerals\u003C\u002Fi>, 10 (12) 1046 \u003Ca target='_blank' href='https:\u002F\u002Fdoi.org\u002F10.3390\u002Fmin10121046'>doi:10.3390\u002Fmin10121046\u003C\u002Fa> \u003Ca target='_blank' href='https:\u002F\u002Fwww.mdpi.com\u002F2075-163X\u002F10\u002F12\u002F1046\u002Fpdf?version=1606272738' class='refpdflink'>\u003C\u002Fa>","10.3390\u002Fmin10121046",{"id":81,"year":82,"html":83,"doi":84},13421837,2021,"Kissin, Aleksander Yurevich, Murzin, Valery Vasilevich, Karaseva, Elizaveta Sergeevna (2021) “Horsetail” Inclusions in the Ural Demantoids: Growth Formations. \u003Ci>Minerals\u003C\u002Fi>, 11 (8) 825 \u003Ca target='_blank' href='https:\u002F\u002Fdoi.org\u002F10.3390\u002Fmin11080825'>doi:10.3390\u002Fmin11080825\u003C\u002Fa> \u003Ca target='_blank' href='https:\u002F\u002Fwww.mdpi.com\u002F2075-163X\u002F11\u002F8\u002F825\u002Fpdf?version=1627638959' class='refpdflink'>\u003C\u002Fa>","10.3390\u002Fmin11080825",{"id":86,"year":87,"html":88,"doi":89},16529789,2022,"Zwaan, J. C. (Hanco) (2022) Demantoid Garnet from Antetezambato, Northern Madagascar—Internal Characteristics and Their Use in Deciphering Geographic Origin. \u003Ci>The Journal of Gemmology\u003C\u002Fi>,  38 (1) 64-79 \u003Ca target='_blank' href='https:\u002F\u002Fdoi.org\u002F10.15506\u002FJoG.2022.38.1.64 '>doi:10.15506\u002FJoG.2022.38.1.64 \u003C\u002Fa>","10.15506\u002FJoG.2022.38.1.64 ",{"id":91,"year":92,"html":93,"doi":94},17110654,2024,"Zhang, Jian-Yi; Li, Geng; Tian, Yu; Schmitz, Fabian (2024) Inclusions and Spectral Characterization of Demantoid from Baluchistan, Pakistan. \u003Ci>Crystals\u003C\u002Fi>,  14 (1). 84 \u003Ca target='_blank' href='https:\u002F\u002Fdoi.org\u002F10.3390\u002Fcryst14010084'>doi:10.3390\u002Fcryst14010084\u003C\u002Fa>","10.3390\u002Fcryst14010084",[96,106,113,123,128,138,146,153,160,167,174,181,189,196,202,210,217,225,232,239,246,254,263,272,281,289,295,303,311,318,327,336,344,352],{"id":97,"source_url":98,"license_code":99,"credit_html":100,"title":101,"description":102,"author":103,"original_width":104,"original_height":105},52027,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=6249777","CC BY-SA 4.0","Raimond Spekking, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=6249777\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Demantoid - Mineralogisches Museum Bonn (7301).jpg","\u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FDemantoid\" class=\"extiw\" title=\"en:Demantoid\">Demantoid\u003C\u002Fa>, variety of \u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FAndradite\" class=\"extiw\" title=\"en:Andradite\">Andradite\u003C\u002Fa> - Locality: Val Malenco, Sondrio, Italy - Exhibited in the Mineralogical Museum, Bonn, Germany","Raimond Spekking",1600,2600,{"id":107,"source_url":108,"license_code":109,"credit_html":110,"title":7,"description":8,"author":8,"original_width":111,"original_height":112},88112,"https:\u002F\u002Fgeocollections.info\u002Ffile\u002F108737","CC BY 4.0","Photo: Unknown author — http:\u002F\u002Fcreativecommons.org\u002Flicenses\u002Fby\u002F4.0\u002F, courtesy of \u003Ca href=\"https:\u002F\u002Fgeocollections.info\u002Ffile\u002F108737\" rel=\"noopener\">Department of Geology, TalTech\u003C\u002Fa> via Europeana",1000,666,{"id":114,"source_url":115,"license_code":116,"credit_html":117,"title":118,"description":119,"author":120,"original_width":121,"original_height":122},52028,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=8158794","Public domain","Elade53, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=8158794\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Demantoid w azbeście - Campo Franscia, Lanterna Valley, Malenco Valley, Prowincja Sondrio, Lombardia, Włochy. 01.jpg","Demantoid w azbeście - Campo Franscia, Lanterna Valley, Malenco Valley, Prowincja Sondrio, Lombardia, Włochy. 01","Elade53",2272,1704,{"id":124,"source_url":125,"license_code":99,"credit_html":126,"title":7,"description":8,"author":8,"original_width":111,"original_height":127},88113,"https:\u002F\u002Fgeocollections.info\u002Ffile\u002F179452","Photo: Unknown author — http:\u002F\u002Fcreativecommons.org\u002Flicenses\u002Fby-sa\u002F4.0\u002F, courtesy of \u003Ca href=\"https:\u002F\u002Fgeocollections.info\u002Ffile\u002F179452\" rel=\"noopener\">University of Tartu, Natural History Museum\u003C\u002Fa> via Europeana",384,{"id":129,"source_url":130,"license_code":131,"credit_html":132,"title":133,"description":134,"author":135,"original_width":136,"original_height":137},52029,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=10136614","CC BY-SA 3.0","Robert M. Lavinsky, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=10136614\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Andradite-64374.jpg","\u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FAndradite\" class=\"extiw\" title=\"en:Andradite\">Andradite\u003C\u002Fa> (Var.: \u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FDemantoid\" class=\"extiw\" title=\"en:Demantoid\">Demantoid\u003C\u002Fa>)\n\u003Cdl>\u003Cdd>\u003Cdl>\u003Cdd>Locality: Malenco Valley, \u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FProvince_of_Sondrio\" class=\"extiw\" title=\"en:Province of Sondrio\">Sondrio Province\u003C\u002Fa>, \u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FLombardy\" class=\"extiw\" title=\"en:Lombardy\">Lombardy\u003C\u002Fa>, Italy (\u003Ca rel=\"nofollow\" class=\"external text\" href=\"http:\u002F\u002Fwww.mindat.org\u002Floc-2086.html\">Locality at mindat.org\u003C\u002Fa>)\u003C\u002Fdd>\n\u003Cdd>A superb, bright, display-quality example of this old classic! Demantoids on matrix are among the rarest of garnets, and these bright and gemmy crystals from Val Malenco are certainly the most desirable of the variety. This is a large specimen with excellent coverage and more importantly crystals of high lustre and deep green color. It is very difficult to find such pieces on the market. 7.4 x 4.8 x 2.5 cm\u003C\u002Fdd>\u003C\u002Fdl>\u003C\u002Fdd>\u003C\u002Fdl>","Robert M. Lavinsky",600,533,{"id":139,"source_url":140,"license_code":131,"credit_html":141,"title":142,"description":143,"author":135,"original_width":144,"original_height":145},52030,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=10138823","Robert M. Lavinsky, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=10138823\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Andradite-117543.jpg","\u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FAndradite\" class=\"extiw\" title=\"en:Andradite\">Andradite\u003C\u002Fa> (Var.: \u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FDemantoid\" class=\"extiw\" title=\"en:Demantoid\">Demantoid\u003C\u002Fa>)\n\u003Cdl>\u003Cdd>\u003Cdl>\u003Cdd>Locality: Tubussis 22 farm (Tubussis; Tubusis; Tubessis), Karibib District, \u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FErongo_Region\" class=\"extiw\" title=\"en:Erongo Region\">Erongo Region\u003C\u002Fa>, Namibia (\u003Ca rel=\"nofollow\" class=\"external text\" href=\"http:\u002F\u002Fwww.mindat.org\u002Floc-145466.html\">Locality at mindat.org\u003C\u002Fa>)\u003C\u002Fdd>\n\u003Cdd>Size: 5 x 4.5 x 3 cm.\u003C\u002Fdd>\n\u003Cdd>Set of three Demantoid Garnets that range in size from .4 - 1.2 cm. Each is gemmy and has an excellent luster. The two smaller crystals are light green in color, while the largest has an excellent medium green color that simply glows when light is passed through the gemmy crystal.\u003C\u002Fdd>\u003C\u002Fdl>\u003C\u002Fdd>\u003C\u002Fdl>",492,500,{"id":147,"source_url":148,"license_code":131,"credit_html":149,"title":150,"description":151,"author":135,"original_width":136,"original_height":152},52034,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=10142087","Robert M. Lavinsky, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=10142087\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Andradite-135081.jpg","\u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FAndradite\" class=\"extiw\" title=\"en:Andradite\">Andradite\u003C\u002Fa> (Var.: \u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FDemantoid\" class=\"extiw\" title=\"en:Demantoid\">Demantoid\u003C\u002Fa>)\n\u003Cdl>\u003Cdd>\u003Cdl>\u003Cdd>Locality: \u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FKandahar_Province\" class=\"extiw\" title=\"en:Kandahar Province\">Kandahar (Qandahar) Province\u003C\u002Fa>, Afghanistan (\u003Ca rel=\"nofollow\" class=\"external text\" href=\"http:\u002F\u002Fwww.mindat.org\u002Floc-30597.html\">Locality at mindat.org\u003C\u002Fa>)\u003C\u002Fdd>\n\u003Cdd>Size: 6.0 x 4.1 x 3.8 cm.\u003C\u002Fdd>\n\u003Cdd>In a shallow pocket is a group of crystals of the extremely rare demantoid varietal of garnet, measuring to 0.5 cm and very gemmy, with light pastel green color and fine luster.\u003C\u002Fdd>\u003C\u002Fdl>\u003C\u002Fdd>\u003C\u002Fdl>",475,{"id":154,"source_url":155,"license_code":131,"credit_html":156,"title":157,"description":158,"author":135,"original_width":159,"original_height":136},52035,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=10148186","Robert M. Lavinsky, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=10148186\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Andradite-163239.jpg","\u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FAndradite\" class=\"extiw\" title=\"en:Andradite\">Andradite\u003C\u002Fa> (Var.: \u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FDemantoid\" class=\"extiw\" title=\"en:Demantoid\">Demantoid\u003C\u002Fa>)\n\u003Cdl>\u003Cdd>\u003Cdl>\u003Cdd>Locality: Tubussis 22 farm (Tubussis; Tubusis; Tubessis), Karibib District, \u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FErongo_Region\" class=\"extiw\" title=\"en:Erongo Region\">Erongo Region\u003C\u002Fa>, Namibia (\u003Ca rel=\"nofollow\" class=\"external text\" href=\"http:\u002F\u002Fwww.mindat.org\u002Floc-145466.html\">Locality at mindat.org\u003C\u002Fa>)\u003C\u002Fdd>\n\u003Cdd>Size: 3.5 x 2.6 x 2.1 cm.\u003C\u002Fdd>\n\u003Cdd>Sharp gemmy garnet, about 1.5 cm, totally complete! The color is a weird shifting hue between yellow and green. Rare in such gemminess and with such sharp form, in this size, on matrix. Ex. Charlie Key.\u003C\u002Fdd>\u003C\u002Fdl>\u003C\u002Fdd>\u003C\u002Fdl>",397,{"id":161,"source_url":162,"license_code":131,"credit_html":163,"title":164,"description":165,"author":135,"original_width":145,"original_height":166},52036,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=10149117","Robert M. Lavinsky, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=10149117\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Andradite-168065.jpg","\u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FAndradite\" class=\"extiw\" title=\"en:Andradite\">Andradite\u003C\u002Fa> (Var.: \u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FDemantoid\" class=\"extiw\" title=\"en:Demantoid\">Demantoid\u003C\u002Fa>)\n\u003Cdl>\u003Cdd>\u003Cdl>\u003Cdd>Locality: Tubussis 22 farm (Tubussis; Tubusis; Tubessis), Karibib District, \u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FErongo_Region\" class=\"extiw\" title=\"en:Erongo Region\">Erongo Region\u003C\u002Fa>, Namibia (\u003Ca rel=\"nofollow\" class=\"external text\" href=\"http:\u002F\u002Fwww.mindat.org\u002Floc-145466.html\">Locality at mindat.org\u003C\u002Fa>)\u003C\u002Fdd>\n\u003Cdd>Size: 4.4 x 3.5 x 3 cm.\u003C\u002Fdd>\n\u003Cdd>A very fine set of super-lustrous partially gemmy Demantoid Garnets. The edges are very sharp, and the little bit of minor bruising is along the back, affecting the presentation side not at all. Perhaps the most amazing thing is that the main crystal is a full 1.9 cm across. An excellent specimen from this locality. Unusually large crystals! Ex. Charlie Key.\u003C\u002Fdd>\u003C\u002Fdl>\u003C\u002Fdd>\u003C\u002Fdl>",463,{"id":168,"source_url":169,"license_code":131,"credit_html":170,"title":171,"description":172,"author":135,"original_width":173,"original_height":136},52037,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=10154079","Robert M. Lavinsky, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=10154079\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Andradite-184678.jpg","\u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FAndradite\" class=\"extiw\" title=\"en:Andradite\">Andradite\u003C\u002Fa> (Var.: \u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FDemantoid\" class=\"extiw\" title=\"en:Demantoid\">Demantoid\u003C\u002Fa>)\n\u003Cdl>\u003Cdd>\u003Cdl>\u003Cdd>Locality: Malenco Valley, \u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FProvince_of_Sondrio\" class=\"extiw\" title=\"en:Province of Sondrio\">Sondrio Province\u003C\u002Fa>, \u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FLombardy\" class=\"extiw\" title=\"en:Lombardy\">Lombardy\u003C\u002Fa>, Italy (\u003Ca rel=\"nofollow\" class=\"external text\" href=\"http:\u002F\u002Fwww.mindat.org\u002Floc-2086.html\">Locality at mindat.org\u003C\u002Fa>)\u003C\u002Fdd>\n\u003Cdd>Size: 3.4 x 3.3 x 1.8 cm.\u003C\u002Fdd>\n\u003Cdd>The Val Malenco became famous amongst mineralogists and collectors for the finds of these very rare green demantoid garnets. Here are four crystals, to 0.5 cm, with sharp faces and fine luster and gemminess, embedded in matrix. Ex. Bill Larson Collection.\u003C\u002Fdd>\u003C\u002Fdl>\u003C\u002Fdd>\u003C\u002Fdl>",504,{"id":175,"source_url":176,"license_code":131,"credit_html":177,"title":178,"description":179,"author":135,"original_width":180,"original_height":136},52038,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=10162529","Robert M. Lavinsky, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=10162529\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Andradite-223863.jpg","\u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FAndradite\" class=\"extiw\" title=\"en:Andradite\">Andradite\u003C\u002Fa> (Var.: \u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FDemantoid\" class=\"extiw\" title=\"en:Demantoid\">Demantoid\u003C\u002Fa>)\n\u003Cdl>\u003Cdd>\u003Cdl>\u003Cdd>Locality: Franscia Mine, Campo Franscia, Lanterna Valley, Malenco Valley, \u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FProvince_of_Sondrio\" class=\"extiw\" title=\"en:Province of Sondrio\">Sondrio Province\u003C\u002Fa>, \u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FLombardy\" class=\"extiw\" title=\"en:Lombardy\">Lombardy\u003C\u002Fa>, Italy (\u003Ca rel=\"nofollow\" class=\"external text\" href=\"http:\u002F\u002Fwww.mindat.org\u002Floc-2084.html\">Locality at mindat.org\u003C\u002Fa>)\u003C\u002Fdd>\n\u003Cdd>Size: 4.1 x 3.8 x 2.9 cm.\u003C\u002Fdd>\n\u003Cdd>This is clearly one of the great Italian Alpine classics. Andradite variety demantoid garnets from Val Malenco (the Malenco Valley) are some of the most prized Alpine garnet specimens in the world. This very showy specimen features a \"ball\" of matrix covered with sharp, gemmy, lustrous, rich green color dodecahedra which measure up to 6 mm. The very sculptural, shoe-looking, matrix, in this case, is fibrous asbestos. These specimens are very difficult to obtain now.\u003C\u002Fdd>\u003C\u002Fdl>\u003C\u002Fdd>\u003C\u002Fdl>",392,{"id":182,"source_url":183,"license_code":131,"credit_html":184,"title":185,"description":186,"author":135,"original_width":187,"original_height":188},52039,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=10164894","Robert M. Lavinsky, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=10164894\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Andradite-237648.jpg","\u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FAndradite\" class=\"extiw\" title=\"en:Andradite\">Andradite\u003C\u002Fa> (Var.: \u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FDemantoid\" class=\"extiw\" title=\"en:Demantoid\">Demantoid\u003C\u002Fa>)\n\u003Cdl>\u003Cdd>\u003Cdl>\u003Cdd>Locality: \u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FGhazni_Province\" class=\"extiw\" title=\"en:Ghazni Province\">Ghazni (Gazni) Province\u003C\u002Fa>, Afghanistan (\u003Ca rel=\"nofollow\" class=\"external text\" href=\"http:\u002F\u002Fwww.mindat.org\u002Floc-30525.html\">Locality at mindat.org\u003C\u002Fa>)\u003C\u002Fdd>\n\u003Cdd>Size: 11.5 x 9.3 x 5.6 cm.\u003C\u002Fdd>\n\u003Cdd>These some of the better Demantoids outside of Europe\u002FRussia in the world in my mind. This hand-sized specimen hosts dozens of small, sharp, highly lustrous, gemmy, bright green modified dodecahedral crystals of Andradite (var \"Demantoid\") on schist matrix. PLEASE NOTE that these crystals show a color change from a \"mint green\" color to a very rich \"lime green\" hue in different lighting. Under halogen lights, the crystals appear more pastel, but under mercury bulbs, the color is very intense.\u003C\u002Fdd>\u003C\u002Fdl>\u003C\u002Fdd>\u003C\u002Fdl>",433,360,{"id":190,"source_url":191,"license_code":131,"credit_html":192,"title":193,"description":194,"author":135,"original_width":195,"original_height":188},52040,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=10165218","Robert M. Lavinsky, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=10165218\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Andradite-239892.jpg","\u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FAndradite\" class=\"extiw\" title=\"en:Andradite\">Andradite\u003C\u002Fa> (Var.: \u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FDemantoid\" class=\"extiw\" title=\"en:Demantoid\">Demantoid\u003C\u002Fa>)\n\u003Cdl>\u003Cdd>\u003Cdl>\u003Cdd>Locality: \u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FGhazni_Province\" class=\"extiw\" title=\"en:Ghazni Province\">Ghazni (Gazni) Province\u003C\u002Fa>, Afghanistan (\u003Ca rel=\"nofollow\" class=\"external text\" href=\"http:\u002F\u002Fwww.mindat.org\u002Floc-30525.html\">Locality at mindat.org\u003C\u002Fa>)\u003C\u002Fdd>\n\u003Cdd>Size: 13.0 x 8.7 x 3.4 cm.\u003C\u002Fdd>\n\u003Cdd>This hand-sized specimen hosts dozens of small, sharp, highly lustrous, gemmy, bright green modified dodecahedral crystals of Andradite (var. \"Demantoid\") on schist matrix. Please note that these crystals show a color change from a \"mint green\" color to a very rich \"lime green\" hue in different lighting. Under halogen lights, the crystals appear more pastel, but under mercury bulbs, the color is very intense.\u003C\u002Fdd>\u003C\u002Fdl>\u003C\u002Fdd>\u003C\u002Fdl>",402,{"id":197,"source_url":198,"license_code":131,"credit_html":199,"title":200,"description":194,"author":135,"original_width":201,"original_height":173},52041,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=10165220","Robert M. Lavinsky, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=10165220\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Andradite-239893.jpg",609,{"id":203,"source_url":204,"license_code":131,"credit_html":205,"title":206,"description":207,"author":135,"original_width":208,"original_height":209},52042,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=10166787","Robert M. Lavinsky, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=10166787\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Andradite-249074.jpg","\u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FAndradite\" class=\"extiw\" title=\"en:Andradite\">Andradite\u003C\u002Fa> (Var.: \u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FDemantoid\" class=\"extiw\" title=\"en:Demantoid\">Demantoid\u003C\u002Fa>)\n\u003Cdl>\u003Cdd>\u003Cdl>\u003Cdd>Locality: \u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FGhazni_Province\" class=\"extiw\" title=\"en:Ghazni Province\">Ghazni (Gazni) Province\u003C\u002Fa>, Afghanistan (\u003Ca rel=\"nofollow\" class=\"external text\" href=\"http:\u002F\u002Fwww.mindat.org\u002Floc-30525.html\">Locality at mindat.org\u003C\u002Fa>)\u003C\u002Fdd>\n\u003Cdd>Size: 9.2 x 5.2 x 3.9 cm.\u003C\u002Fdd>\n\u003Cdd>I have only seen a handful of these specimens over the years, and I always keep an eye out at shows for them because they're some of the better Demantoids outside of Europe\u002FRussia in the world in my mind. This hand-sized display specimen hosts dozens of small, sharp, highly lustrous, gemmy, bright green slightly modified dodecahedral crystals of Andradite (var \"Demantoid\") on schist matrix. Please note that these crystals show a color change from a \"mint green\" color to a very rich \"lime green\" hue in different lighting. Under halogen lights, the crystals appear more pastel, but under mercury bulbs, the color is very intense. The beautiful color contrast on this piece is truly eye-catching, and it is not common to find cabinet sized specimens of this rare green Garnet.\u003C\u002Fdd>\u003C\u002Fdl>\u003C\u002Fdd>\u003C\u002Fdl>",567,432,{"id":211,"source_url":212,"license_code":131,"credit_html":213,"title":214,"description":215,"author":135,"original_width":216,"original_height":209},52043,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=10167875","Robert M. Lavinsky, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=10167875\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Andradite-252691.jpg","\u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FAndradite\" class=\"extiw\" title=\"en:Andradite\">Andradite\u003C\u002Fa> (Var.: \u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FDemantoid\" class=\"extiw\" title=\"en:Demantoid\">Demantoid\u003C\u002Fa>)\n\u003Cdl>\u003Cdd>\u003Cdl>\u003Cdd>Locality: \u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FGhazni_Province\" class=\"extiw\" title=\"en:Ghazni Province\">Ghazni (Gazni) Province\u003C\u002Fa>, Afghanistan (\u003Ca rel=\"nofollow\" class=\"external text\" href=\"http:\u002F\u002Fwww.mindat.org\u002Floc-30525.html\">Locality at mindat.org\u003C\u002Fa>)\u003C\u002Fdd>\n\u003Cdd>Size: 6.9 x 6.8 x 2.8 cm.\u003C\u002Fdd>\n\u003Cdd>I have only seen a handful of these specimens over the years, and I always keep an eye out at shows for them because they're some of the better Demantoids outside of Europe\u002FRussia in the world in my mind. This hand-sized display specimen hosts dozens of small, sharp, highly lustrous, gemmy, bright green modified dodecahedral crystals of Andradite (var \"Demantoid\") on schist matrix. PLEASE NOTE that these crystals show a color change from a \"mint green\" color to a very rich \"lime green\" hue in different lighting. Under halogen lights, the crystals appear more pastel, but under mercury bulbs, the color is very intense.\u003C\u002Fdd>\u003C\u002Fdl>\u003C\u002Fdd>\u003C\u002Fdl>",476,{"id":218,"source_url":219,"license_code":131,"credit_html":220,"title":221,"description":222,"author":135,"original_width":223,"original_height":224},52044,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=10167955","Robert M. Lavinsky, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=10167955\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Andradite-253936.jpg","\u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FAndradite\" class=\"extiw\" title=\"en:Andradite\">Andradite\u003C\u002Fa> (Var.: \u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FDemantoid\" class=\"extiw\" title=\"en:Demantoid\">Demantoid\u003C\u002Fa>)\n\u003Cdl>\u003Cdd>\u003Cdl>\u003Cdd>Locality: Korkodinskoe (Karkodinskoe; Novo-Karkodinskoe) demantoid deposit, Korkodin, \u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FChelyabinsk_Oblast\" class=\"extiw\" title=\"en:Chelyabinsk Oblast\">Chelyabinsk Oblast'\u003C\u002Fa>, Southern Urals, Urals Region, Russia (\u003Ca rel=\"nofollow\" class=\"external text\" href=\"http:\u002F\u002Fwww.mindat.org\u002Floc-4653.html\">Locality at mindat.org\u003C\u002Fa>)\u003C\u002Fdd>\n\u003Cdd>Size: 3.4 x 2.0 x 1.9 cm.\u003C\u002Fdd>\n\u003Cdd>Sharp, lustrous, translucent, apple-green demantoid garnet crystals richly and attractively cover matrix on this very fine specimen from an uncommon locality in the Ural Mountains of Russia - Kakodino. The crystals reach 1.3 cm.\u003C\u002Fdd>\u003C\u002Fdl>\u003C\u002Fdd>\u003C\u002Fdl>",750,518,{"id":226,"source_url":227,"license_code":131,"credit_html":228,"title":229,"description":230,"author":135,"original_width":231,"original_height":188},52045,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=10171066","Robert M. Lavinsky, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=10171066\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Andradite-271592.jpg","\u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FAndradite\" class=\"extiw\" title=\"en:Andradite\">Andradite\u003C\u002Fa> (Var.: \u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FDemantoid\" class=\"extiw\" title=\"en:Demantoid\">Demantoid\u003C\u002Fa>)\n\u003Cdl>\u003Cdd>\u003Cdl>\u003Cdd>Locality: Antetezambato (Tetezambato), \u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FAmbanja_District\" class=\"extiw\" title=\"en:Ambanja District\">Ambanja District\u003C\u002Fa>, \u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FDiana,_Madagascar\" class=\"extiw\" title=\"en:Diana, Madagascar\">Diana (Northern) Region\u003C\u002Fa>, \u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FAntsiranana_Province\" class=\"extiw\" title=\"en:Antsiranana Province\">Antsiranana Province\u003C\u002Fa>, Madagascar (\u003Ca rel=\"nofollow\" class=\"external text\" href=\"http:\u002F\u002Fwww.mindat.org\u002Floc-210868.html\">Locality at mindat.org\u003C\u002Fa>)\u003C\u002Fdd>\n\u003Cdd>Size: 5.4 x 4. 4x 2.7 cm.\u003C\u002Fdd>\n\u003Cdd>Recently (2008-2009), there was a discovery of some of outstanding quality Demantoid Garnets in Madagascar. The quality and color of these crystals rivals pieces I have seen from Italy, Namibia or even Russia. This specimen hosts dozens of very sharp, rather lustrous, excellent quality, beautiful green colored, gemmy, modified dodecahedral and trapezohedral Demantoid crystals on a contrasting white matrix. The luster on these crystals is superb for Demantoid, and the largest crystal measures 4 mm, which is decent sized for the find. Please note that under halogen lights, the crystals appear a bit lighter in color, but under mercury bulbs, the color is very intense.\u003C\u002Fdd>\u003C\u002Fdl>\u003C\u002Fdd>\u003C\u002Fdl>",410,{"id":233,"source_url":234,"license_code":131,"credit_html":235,"title":236,"description":237,"author":135,"original_width":145,"original_height":238},52046,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=10171212","Robert M. Lavinsky, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=10171212\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Andradite-272643.jpg","\u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FAndradite\" class=\"extiw\" title=\"en:Andradite\">Andradite\u003C\u002Fa> (Var.: \u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FDemantoid\" class=\"extiw\" title=\"en:Demantoid\">Demantoid\u003C\u002Fa>)\n\u003Cdl>\u003Cdd>\u003Cdl>\u003Cdd>Locality: Soghan, Baft District, \u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FKerm%C4%81n_Province\" class=\"extiw\" title=\"en:Kermān Province\">Kerman Province\u003C\u002Fa>, Iran (\u003Ca rel=\"nofollow\" class=\"external text\" href=\"http:\u002F\u002Fwww.mindat.org\u002Floc-2012.html\">Locality at mindat.org\u003C\u002Fa>)\u003C\u002Fdd>\n\u003Cdd>Size: 2.2 x 1.6 x 1.3 cm.\u003C\u002Fdd>\n\u003Cdd>Deep-green to emerald-green, this translucent crystal of Andradite (var: Demantoid) is 2.2 cm long. It is superb for the locality, from Charlie Key's choice collection of worldwide thumbnails. This euhedral crystal has well-formed, complex faces, and is a very good example of a Demantoid Garnet thumbnail from Iran. The intensity of the emerald-green portions of the crystal is quite eye-catching, and nearly unique for this locality. This is quite large for a single crystal from here, in good condition.\u003C\u002Fdd>\u003C\u002Fdl>\u003C\u002Fdd>\u003C\u002Fdl>",381,{"id":240,"source_url":241,"license_code":131,"credit_html":242,"title":243,"description":244,"author":135,"original_width":245,"original_height":238},52047,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=10174607","Robert M. Lavinsky, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=10174607\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Andradite-290704.jpg","\u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FAndradite\" class=\"extiw\" title=\"en:Andradite\">Andradite\u003C\u002Fa> (Var.: \u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FDemantoid\" class=\"extiw\" title=\"en:Demantoid\">Demantoid\u003C\u002Fa>)\n\u003Cdl>\u003Cdd>\u003Cdl>\u003Cdd>Locality: Antetezambato (Tetezambato), \u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FAmbanja_District\" class=\"extiw\" title=\"en:Ambanja District\">Ambanja District\u003C\u002Fa>, \u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FDiana,_Madagascar\" class=\"extiw\" title=\"en:Diana, Madagascar\">Diana (Northern) Region\u003C\u002Fa>, \u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FAntsiranana_Province\" class=\"extiw\" title=\"en:Antsiranana Province\">Antsiranana Province\u003C\u002Fa>, Madagascar (\u003Ca rel=\"nofollow\" class=\"external text\" href=\"http:\u002F\u002Fwww.mindat.org\u002Floc-210868.html\">Locality at mindat.org\u003C\u002Fa>)\u003C\u002Fdd>\n\u003Cdd>Size: 6.2 x 4.2 x 4.2 cm.\u003C\u002Fdd>\n\u003Cdd>Recently (2008-2009), there was a discovery of some of outstanding quality Demantoid Garnets in Madagascar. The quality and color of these crystals rivals pieces I have seen from Italy, Namibia or even Russia. This specimen hosts dozens of very sharp, lustrous, excellent quality, rich green color, gemmy, modified dodecahedral and trapezohedral Demantoid crystals on a contrasting white matrix. The luster on these crystals is superb for Demantoid, and the largest crystal measures a full 1.0 cm, which is very good sized for the find. I cannot say for certain if there will be more of these pieces. Please note that under halogen lights, the crystals appear a bit lighter in color, but under mercury bulbs, the color is very intense.\u003C\u002Fdd>\u003C\u002Fdl>\u003C\u002Fdd>\u003C\u002Fdl>",465,{"id":247,"source_url":248,"license_code":131,"credit_html":249,"title":250,"description":251,"author":135,"original_width":252,"original_height":253},52048,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=10452510","Robert M. Lavinsky, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=10452510\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Andradite-dem45b.jpg","\u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FAndradite\" class=\"extiw\" title=\"en:Andradite\">Andradite\u003C\u002Fa>\n\u003Cdl>\u003Cdd>\u003Cdl>\u003Cdd>Locality: Antetezambato (Tetezambato), \u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FAmbanja_District\" class=\"extiw\" title=\"en:Ambanja District\">Ambanja District\u003C\u002Fa>, \u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FDiana,_Madagascar\" class=\"extiw\" title=\"en:Diana, Madagascar\">Diana (Northern) Region\u003C\u002Fa>, \u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FAntsiranana_Province\" class=\"extiw\" title=\"en:Antsiranana Province\">Antsiranana Province\u003C\u002Fa>, Madagascar (\u003Ca rel=\"nofollow\" class=\"external text\" href=\"http:\u002F\u002Fwww.mindat.org\u002Floc-210868.html\">Locality at mindat.org\u003C\u002Fa>)\u003C\u002Fdd>\n\u003Cdd>Size: miniature, 5.3 x 5.2 x 2.4 cm\n\u003Cdl>\u003Cdt>Andradite var. Demantoid garnet\u003C\u002Fdt>\u003C\u002Fdl>\u003C\u002Fdd>\n\u003Cdd>A sinuous ribbon of glassy and gemmy, light olive-green demantoid crystals, to 1.5 cm across, is perched high on a white massive garnet matrix. A few of the crystals are also doubly terminated. The richness of the piece is good, as are the size of the crystals. The color is a little more olive than intensely green, but still at least comparable to most Italian demantoid of past finds, and pretty good by any standard. For overall aesthetics and richness in this price range, I thought this one of the better deals in the lot.\u003C\u002Fdd>\u003C\u002Fdl>\u003C\u002Fdd>\u003C\u002Fdl>",1800,1063,{"id":255,"source_url":256,"license_code":131,"credit_html":257,"title":258,"description":259,"author":260,"original_width":261,"original_height":262},52049,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=10555571","Didier Descouens, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=10555571\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Demantoide.jpg","\u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FAndradite\" class=\"extiw\" title=\"en:Andradite\">Andradite\u003C\u002Fa> (Var.: \u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FDemantoid\" class=\"extiw\" title=\"en:Demantoid\">Demantoid\u003C\u002Fa>)- Locality: Jeffrey mine (Jeffrey quarry; Johns-Manville mine), \u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FAsbestos\" class=\"extiw\" title=\"en:Asbestos\">Asbestos\u003C\u002Fa>, Les Sources RCM, \u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FEstrie\" class=\"extiw\" title=\"en:Estrie\">Estrie\u003C\u002Fa>, \u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FQuebec\" class=\"extiw\" title=\"en:Quebec\">Québec\u003C\u002Fa>, Canada - Size of view : 2 cm.","Didier Descouens",3804,3056,{"id":264,"source_url":265,"license_code":116,"credit_html":266,"title":267,"description":268,"author":269,"original_width":270,"original_height":271},52050,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=11373458","Parent Géry, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=11373458\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Démantoïde (Madagascar).jpg","garnet var. andradite var. demantoid : Antetezambato (Tetezambato), Ambanja District, Diana (Northern) Region, Antsiranana Province, Madagascar","Parent Géry",3917,2848,{"id":273,"source_url":274,"license_code":109,"credit_html":275,"title":276,"description":277,"author":278,"original_width":279,"original_height":280},52051,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=153724360","Lech Darski, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=153724360\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Granat demantoid - Antetezambato, Ambanja District, Diana (Northern) Region, Antsiranana Province, Madagaskar.jpg","Granat demantoid.","Lech Darski",4359,2906,{"id":282,"source_url":283,"license_code":131,"credit_html":284,"title":285,"description":286,"author":135,"original_width":287,"original_height":288},1390,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=10452192","Robert M. Lavinsky, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=10452192\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Andradite-dem03c.jpg","\u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FAndradite\" class=\"extiw\" title=\"en:Andradite\">Andradite\u003C\u002Fa>\n\u003Cdl>\u003Cdd>\u003Cdl>\u003Cdd>Locality: Antetezambato (Tetezambato), \u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FAmbanja_District\" class=\"extiw\" title=\"en:Ambanja District\">Ambanja District\u003C\u002Fa>, \u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FDiana,_Madagascar\" class=\"extiw\" title=\"en:Diana, Madagascar\">Diana (Northern) Region\u003C\u002Fa>, \u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FAntsiranana_Province\" class=\"extiw\" title=\"en:Antsiranana Province\">Antsiranana Province\u003C\u002Fa>, Madagascar (\u003Ca rel=\"nofollow\" class=\"external text\" href=\"http:\u002F\u002Fwww.mindat.org\u002Floc-210868.html\">Locality at mindat.org\u003C\u002Fa>)\u003C\u002Fdd>\n\u003Cdd>Size: miniature, 3.3 x 2.4 x 1.8 cm\n\u003Cdl>\u003Cdt>Andradite var. Demantoid garnet\u003C\u002Fdt>\u003C\u002Fdl>\u003C\u002Fdd>\n\u003Cdd>Two sharp, glassy and gemmy, olive-green demantoid crystals , to 1.2 cm in length, are perched on a garnet matrix. Both crystals exhibit unusual and evident hoppered growth, which is rare in the garnet family. Riveting for the symmetry and sharp forms, this is a fine small miniature or, trimmed at bottom, a killer thumbnail specimen\u003C\u002Fdd>\u003C\u002Fdl>\u003C\u002Fdd>\u003C\u002Fdl>",1051,1500,{"id":290,"source_url":291,"license_code":131,"credit_html":292,"title":293,"description":286,"author":135,"original_width":294,"original_height":111},32938,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=10452191","Robert M. Lavinsky, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=10452191\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Andradite-dem03b.jpg",700,{"id":296,"source_url":297,"license_code":131,"credit_html":298,"title":299,"description":300,"author":135,"original_width":301,"original_height":302},52031,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=10139375","Robert M. Lavinsky, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=10139375\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Andradite-118707.jpg","\u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FAndradite\" class=\"extiw\" title=\"en:Andradite\">Andradite\u003C\u002Fa> (Var.: \u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FDemantoid\" class=\"extiw\" title=\"en:Demantoid\">Demantoid\u003C\u002Fa>)\n\u003Cdl>\u003Cdd>\u003Cdl>\u003Cdd>Locality: Tubussis 22 farm (Tubussis; Tubusis; Tubessis), Karibib District, \u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FErongo_Region\" class=\"extiw\" title=\"en:Erongo Region\">Erongo Region\u003C\u002Fa>, Namibia (\u003Ca rel=\"nofollow\" class=\"external text\" href=\"http:\u002F\u002Fwww.mindat.org\u002Floc-145466.html\">Locality at mindat.org\u003C\u002Fa>)\u003C\u002Fdd>\n\u003Cdd>Size: 10.7 x 5.8 x 4.5 cm.\u003C\u002Fdd>\n\u003Cdd>Sitting on a bed of hundreds, if not thousands, of quartz crystals, the dozens upon dozens of Demantoids all have good color and are gemmy. The largest, which is about 1.2 cm, is quite gemmy and is composed of compound crystals.\u003C\u002Fdd>\u003C\u002Fdl>\u003C\u002Fdd>\u003C\u002Fdl>",499,332,{"id":304,"source_url":305,"license_code":131,"credit_html":306,"title":307,"description":308,"author":135,"original_width":309,"original_height":310},52032,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=10141750","Robert M. Lavinsky, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=10141750\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Andradite-132366.jpg","\u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FAndradite\" class=\"extiw\" title=\"en:Andradite\">Andradite\u003C\u002Fa> (Var.: \u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FDemantoid\" class=\"extiw\" title=\"en:Demantoid\">Demantoid\u003C\u002Fa>)\n\u003Cdl>\u003Cdd>\u003Cdl>\u003Cdd>Locality: Tubussis 22 farm (Tubussis; Tubusis; Tubessis), Karibib District, \u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FErongo_Region\" class=\"extiw\" title=\"en:Erongo Region\">Erongo Region\u003C\u002Fa>, Namibia (\u003Ca rel=\"nofollow\" class=\"external text\" href=\"http:\u002F\u002Fwww.mindat.org\u002Floc-145466.html\">Locality at mindat.org\u003C\u002Fa>)\u003C\u002Fdd>\n\u003Cdd>Size: 5.4 x 4.1 x 3.1 cm.\u003C\u002Fdd>\n\u003Cdd>Two sharp, gemmy and lustrous, leaf-green andradite variety demantoid garnet crystals to 6 mm attractively set in contrasting calc-silicate matrix from recent finds at Tubussis Farm 22 near the Erongo Mountains of Namibia. The large, gem crystal is pristine and the lightly bruised other garnet crystal is certainly not a detraction. Highly representative of the species and locality.\u003C\u002Fdd>\u003C\u002Fdl>\u003C\u002Fdd>\u003C\u002Fdl>",550,426,{"id":312,"source_url":313,"license_code":131,"credit_html":314,"title":315,"description":308,"author":135,"original_width":316,"original_height":317},52033,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=10141752","Robert M. Lavinsky, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=10141752\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Andradite-132367.jpg",450,341,{"id":319,"source_url":320,"license_code":99,"credit_html":321,"title":322,"description":323,"author":324,"original_width":325,"original_height":326},31139,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=129538673","Kaethe17, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=129538673\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Andradit-aktinolith.jpg","\u003Ca href=\"https:\u002F\u002Fde.wikipedia.org\u002Fwiki\u002FAndradit\" class=\"extiw\" title=\"de:Andradit\">Andradit\u003C\u002Fa>, Varietät Demantoid, in Gestein aus u.a. \u003Ca href=\"https:\u002F\u002Fde.wikipedia.org\u002Fwiki\u002FAktinolith\" class=\"extiw\" title=\"de:Aktinolith\">Aktinolith\u003C\u002Fa>-Asbest\n\u003Cdl>\u003Cdd>\u003Cdl>\u003Cdd>\u003Cdl>\u003Cdd>Gewicht: 274g\u003C\u002Fdd>\n\u003Cdd>Fundort: Monte Acquanegra, östlich Chiesa, oberes \u003Ca href=\"https:\u002F\u002Fde.wikipedia.org\u002Fwiki\u002FValmalenco\" class=\"extiw\" title=\"de:Valmalenco\">Valmalenco\u003C\u002Fa>, NO Comer See, Provinz Sondrio, Italien\u003C\u002Fdd>\u003C\u002Fdl>\u003C\u002Fdd>\u003C\u002Fdl>\u003C\u002Fdd>\u003C\u002Fdl>","Kaethe17",4844,3382,{"id":328,"source_url":329,"license_code":330,"credit_html":331,"title":332,"description":333,"author":334,"original_width":335,"original_height":122},75739,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=159336358","CC BY 2.0","James St. John, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=159336358\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Demantoid garnets (Green Fire Mine, California, USA) 1.jpg","Demantoid garnets on chlorite on serpentinite from the Miocene of California, USA. (field of view ~3.0 centimeters across)\n\u003Cp>A mineral is a naturally-occurring, solid, inorganic, crystalline substance having a fairly definite chemical composition and having fairly definite physical properties.  At its simplest, a mineral is a naturally-occurring solid chemical.  Currently, there are about 6100 named and described minerals - about 200 of them are common and about 20 of them are very common.  Mineral classification is based on anion chemistry.  Major categories of minerals are: elements, sulfides, oxides, halides, carbonates, sulfates, phosphates, and silicates.\n\u003C\u002Fp>\u003Cp>The silicates are the most abundant and chemically complex group of minerals.  All silicates have silica as the basis for their chemistry.  \"Silica\" refers to SiO2 chemistry.  The fundamental molecular unit of silica is one small silicon atom surrounded by four large oxygen atoms in the shape of a triangular pyramid - this is the silica tetrahedron - SiO4.  Each oxygen atom is shared by two silicon atoms, so only half of the four oxygens \"belong\" to each silicon.  The resulting formula for silica is thus SiO2, not SiO4.\n\u003C\u002Fp>\u003Cp>Garnet is a group of silicate minerals.  Garnets are expected to be red to dark red in color - many of them are, but several garnet varieties can be other colors, including purple, orange, olive green, deep green, and black.  Garnets form 12-sided crystals (dodecahedrons) or crystals with even more faces on them.  The crystals become more and more rounded as the crystal face number increases.  Garnet has a nonmetallic, glassy luster, whitish streak, is quite hard (H = 7), has no cleavage, and has conchoidal fracture.\n\u003C\u002Fp>\u003Cp>Common examples of garnet include almandine, grossular, spessartine, and andradite.\n\u003C\u002Fp>\u003Cp>Andradite is the most common variety of calcium garnet.  Andradite is a calcium-iron garnet (Ca3Fe2Si3O12 - calcium iron silicate).  It varies in color from yellowish to greenish to brownish to blackish.  Green, chromium-bearing andradite is called demantoid.\n\u003C\u002Fp>\u003Cp>Seen here are demantoid garnets on clinochlore chlorite on serpentinite from a Tertiary-aged serpentinite body in California.  The host rock is part of the New Idria Serpentinite, a large serpentinite mass that is apparently a diapir of altered mantle peridotite.\n\u003C\u002Fp>\u003Cp>Host rock: New Idria Serpentinite, Middle Miocene, ~14 Ma\n\u003C\u002Fp>\u003Cp>Locality: Green Fire Mine, New Idria Mining District, Diablo Range, San Benito County, Coast Ranges, western California, USA\n\u003C\u002Fp>\n\u003Chr>\n\u003Cp>Photo gallery of demantoid garnet:\nwww.mindat.org\u002Fgallery.php?min=1258\n\u003C\u002Fp>\n\u003Chr>\n\u003Cp>Photo gallery of andradite garnet:\n\u003C\u002Fp>\nwww.mindat.org\u002Fgallery.php?min=223","James St. John",1394,{"id":337,"source_url":338,"license_code":330,"credit_html":339,"title":340,"description":341,"author":334,"original_width":342,"original_height":343},75740,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=159336359","James St. John, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=159336359\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Demantoid garnets (Green Fire Mine, California, USA) 2.jpg","Demantoid garnets on chlorite on serpentinite from the Miocene of California, USA. (field of view ~2.9 centimeters across)\n\u003Cp>A mineral is a naturally-occurring, solid, inorganic, crystalline substance having a fairly definite chemical composition and having fairly definite physical properties.  At its simplest, a mineral is a naturally-occurring solid chemical.  Currently, there are about 6100 named and described minerals - about 200 of them are common and about 20 of them are very common.  Mineral classification is based on anion chemistry.  Major categories of minerals are: elements, sulfides, oxides, halides, carbonates, sulfates, phosphates, and silicates.\n\u003C\u002Fp>\u003Cp>The silicates are the most abundant and chemically complex group of minerals.  All silicates have silica as the basis for their chemistry.  \"Silica\" refers to SiO2 chemistry.  The fundamental molecular unit of silica is one small silicon atom surrounded by four large oxygen atoms in the shape of a triangular pyramid - this is the silica tetrahedron - SiO4.  Each oxygen atom is shared by two silicon atoms, so only half of the four oxygens \"belong\" to each silicon.  The resulting formula for silica is thus SiO2, not SiO4.\n\u003C\u002Fp>\u003Cp>Garnet is a group of silicate minerals.  Garnets are expected to be red to dark red in color - many of them are, but several garnet varieties can be other colors, including purple, orange, olive green, deep green, and black.  Garnets form 12-sided crystals (dodecahedrons) or crystals with even more faces on them.  The crystals become more and more rounded as the crystal face number increases.  Garnet has a nonmetallic, glassy luster, whitish streak, is quite hard (H = 7), has no cleavage, and has conchoidal fracture.\n\u003C\u002Fp>\u003Cp>Common examples of garnet include almandine, grossular, spessartine, and andradite.\n\u003C\u002Fp>\u003Cp>Andradite is the most common variety of calcium garnet.  Andradite is a calcium-iron garnet (Ca3Fe2Si3O12 - calcium iron silicate).  It varies in color from yellowish to greenish to brownish to blackish.  Green, chromium-bearing andradite is called demantoid.\n\u003C\u002Fp>\u003Cp>Seen here are demantoid garnets on clinochlore chlorite on serpentinite from a Tertiary-aged serpentinite body in California.  The host rock is part of the New Idria Serpentinite, a large serpentinite mass that is apparently a diapir of altered mantle peridotite.\n\u003C\u002Fp>\u003Cp>Host rock: New Idria Serpentinite, Middle Miocene, ~14 Ma\n\u003C\u002Fp>\u003Cp>Locality: Green Fire Mine, New Idria Mining District, Diablo Range, San Benito County, Coast Ranges, western California, USA\n\u003C\u002Fp>\n\u003Chr>\n\u003Cp>Photo gallery of demantoid garnet:\nwww.mindat.org\u002Fgallery.php?min=1258\n\u003C\u002Fp>\n\u003Chr>\n\u003Cp>Photo gallery of andradite garnet:\n\u003C\u002Fp>\nwww.mindat.org\u002Fgallery.php?min=223",1256,741,{"id":345,"source_url":346,"license_code":330,"credit_html":347,"title":348,"description":349,"author":334,"original_width":350,"original_height":351},75742,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=159336362","James St. John, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=159336362\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Demantoid garnets (Green Fire Mine, California, USA) 3.jpg","Demantoid garnets on chlorite on serpentinite from the Miocene of California, USA. (field of view ~3.3 centimeters across)\n\u003Cp>A mineral is a naturally-occurring, solid, inorganic, crystalline substance having a fairly definite chemical composition and having fairly definite physical properties.  At its simplest, a mineral is a naturally-occurring solid chemical.  Currently, there are about 6100 named and described minerals - about 200 of them are common and about 20 of them are very common.  Mineral classification is based on anion chemistry.  Major categories of minerals are: elements, sulfides, oxides, halides, carbonates, sulfates, phosphates, and silicates.\n\u003C\u002Fp>\u003Cp>The silicates are the most abundant and chemically complex group of minerals.  All silicates have silica as the basis for their chemistry.  \"Silica\" refers to SiO2 chemistry.  The fundamental molecular unit of silica is one small silicon atom surrounded by four large oxygen atoms in the shape of a triangular pyramid - this is the silica tetrahedron - SiO4.  Each oxygen atom is shared by two silicon atoms, so only half of the four oxygens \"belong\" to each silicon.  The resulting formula for silica is thus SiO2, not SiO4.\n\u003C\u002Fp>\u003Cp>Garnet is a group of silicate minerals.  Garnets are expected to be red to dark red in color - many of them are, but several garnet varieties can be other colors, including purple, orange, olive green, deep green, and black.  Garnets form 12-sided crystals (dodecahedrons) or crystals with even more faces on them.  The crystals become more and more rounded as the crystal face number increases.  Garnet has a nonmetallic, glassy luster, whitish streak, is quite hard (H = 7), has no cleavage, and has conchoidal fracture.\n\u003C\u002Fp>\u003Cp>Common examples of garnet include almandine, grossular, spessartine, and andradite.\n\u003C\u002Fp>\u003Cp>Andradite is the most common variety of calcium garnet.  Andradite is a calcium-iron garnet (Ca3Fe2Si3O12 - calcium iron silicate).  It varies in color from yellowish to greenish to brownish to blackish.  Green, chromium-bearing andradite is called demantoid.\n\u003C\u002Fp>\u003Cp>Seen here are demantoid garnets on clinochlore chlorite on serpentinite from a Tertiary-aged serpentinite body in California.  The host rock is part of the New Idria Serpentinite, a large serpentinite mass that is apparently a diapir of altered mantle peridotite.\n\u003C\u002Fp>\u003Cp>Host rock: New Idria Serpentinite, Middle Miocene, ~14 Ma\n\u003C\u002Fp>\u003Cp>Locality: Green Fire Mine, New Idria Mining District, Diablo Range, San Benito County, Coast Ranges, western California, USA\n\u003C\u002Fp>\n\u003Chr>\n\u003Cp>Photo gallery of demantoid garnet:\nwww.mindat.org\u002Fgallery.php?min=1258\n\u003C\u002Fp>\n\u003Chr>\n\u003Cp>Photo gallery of andradite garnet:\n\u003C\u002Fp>\nwww.mindat.org\u002Fgallery.php?min=223",1325,1715,{"id":353,"source_url":354,"license_code":330,"credit_html":355,"title":356,"description":357,"author":334,"original_width":358,"original_height":359},75743,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=159336364","James St. John, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=159336364\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Demantoid garnets (Green Fire Mine, California, USA) 4.jpg","Demantoid garnets on chlorite on serpentinite from the Miocene of California, USA. (field of view ~3.8 centimeters across)\n\u003Cp>A mineral is a naturally-occurring, solid, inorganic, crystalline substance having a fairly definite chemical composition and having fairly definite physical properties.  At its simplest, a mineral is a naturally-occurring solid chemical.  Currently, there are about 6100 named and described minerals - about 200 of them are common and about 20 of them are very common.  Mineral classification is based on anion chemistry.  Major categories of minerals are: elements, sulfides, oxides, halides, carbonates, sulfates, phosphates, and silicates.\n\u003C\u002Fp>\u003Cp>The silicates are the most abundant and chemically complex group of minerals.  All silicates have silica as the basis for their chemistry.  \"Silica\" refers to SiO2 chemistry.  The fundamental molecular unit of silica is one small silicon atom surrounded by four large oxygen atoms in the shape of a triangular pyramid - this is the silica tetrahedron - SiO4.  Each oxygen atom is shared by two silicon atoms, so only half of the four oxygens \"belong\" to each silicon.  The resulting formula for silica is thus SiO2, not SiO4.\n\u003C\u002Fp>\u003Cp>Garnet is a group of silicate minerals.  Garnets are expected to be red to dark red in color - many of them are, but several garnet varieties can be other colors, including purple, orange, olive green, deep green, and black.  Garnets form 12-sided crystals (dodecahedrons) or crystals with even more faces on them.  The crystals become more and more rounded as the crystal face number increases.  Garnet has a nonmetallic, glassy luster, whitish streak, is quite hard (H = 7), has no cleavage, and has conchoidal fracture.\n\u003C\u002Fp>\u003Cp>Common examples of garnet include almandine, grossular, spessartine, and andradite.\n\u003C\u002Fp>\u003Cp>Andradite is the most common variety of calcium garnet.  Andradite is a calcium-iron garnet (Ca3Fe2Si3O12 - calcium iron silicate).  It varies in color from yellowish to greenish to brownish to blackish.  Green, chromium-bearing andradite is called demantoid.\n\u003C\u002Fp>\u003Cp>Seen here are demantoid garnets on clinochlore chlorite on serpentinite from a Tertiary-aged serpentinite body in California.  The host rock is part of the New Idria Serpentinite, a large serpentinite mass that is apparently a diapir of altered mantle peridotite.\n\u003C\u002Fp>\u003Cp>Host rock: New Idria Serpentinite, Middle Miocene, ~14 Ma\n\u003C\u002Fp>\u003Cp>Locality: Green Fire Mine, New Idria Mining District, Diablo Range, San Benito County, Coast Ranges, western California, USA\n\u003C\u002Fp>\n\u003Chr>\n\u003Cp>Photo gallery of demantoid garnet:\nwww.mindat.org\u002Fgallery.php?min=1258\n\u003C\u002Fp>\n\u003Chr>\n\u003Cp>Photo gallery of andradite garnet:\n\u003C\u002Fp>\nwww.mindat.org\u002Fgallery.php?min=223",2254,1350,[],[],[],{"history":364,"applications":368},{"markdown":365,"model_version":366,"prompt_version":367,"reviewed_at":8},"The name carries a promise. A green garnet that throws so much fire made its early observers reach for the one comparison everyone understood — diamond. Demantoid is the green gem variety of andradite, a calcium-iron member of the garnet family.\n\nGarnets had been worn since antiquity, but this brilliant green kind was not found until 1851, in the western central Ural Mountains of Russia[1]. The first stones came from an alluvial deposit — gravel washed and concentrated by water — along the Bobrovka River. The site lies about 110 km north-northwest of Ekaterinburg, near the village of Elizavetinskoye[1]. A second source was later worked to the south of the city, on the Chusovaya and Chrisolitka rivers[2].\n\nThe Finnish mineralogist Nils Gustaf Nordenskiøld gave the gem its name a few years after the find[3]. He took it from the old German word *Demant*, meaning diamond, in tribute to the stone's diamond-like brilliance[3]. The grass-green to emerald-green colour comes from a trace of chromium sitting in the iron framework of the crystal[4].\n\nThe timing was good. From the discovery until about 1919, demantoid was fashionable in Russia, and the celebrated court jeweller Peter Carl Fabergé set the green stones into his work[5]. After the Russian Revolution, in the austerity of Communist Russia, the gem fell out of fashion[6].\n\n### The horsetail signature\n\nRussian demantoid carries a clue to its origin inside the stone itself. Many crystals enclose fine fibres of chrysotile, a form of asbestos, that radiate outward from a tiny central crystal of chromite[7]. The golden threads curve as they spread and look like the tail of a horse, which is why cutters call them horsetail inclusions[7]. Gemmologists treat the horsetail as diagnostic: it confirms a natural demantoid, because the feature is not found in any other green gemstone[8].\n\nFor most of the 20th century the Ural mines were the only meaningful source. That changed in 1996, when a major find of demantoid and andradite came to light in Namibia, at the deposit now called the Green Dragon mine[9]. Around 2009 another significant discovery followed in Madagascar[10].","claude-opus-4-8","1.7.0",{"markdown":369,"model_version":366,"prompt_version":367,"reviewed_at":8},"Demantoid has no industrial use. It is a gemstone, cut and set for its beauty alone, and prized by collectors of fine coloured stones.\n\nIts appeal rests on fire — the way a faceted stone splits white light into flashes of rainbow colour. Demantoid disperses light unusually strongly, with a dispersion value of 0.057, higher than diamond's, so the effect is easy to see[1]. A high refractive index, between 1.80 and 1.89, adds to the brilliance by bending and returning more of the light that enters the stone[2].\n\nFine demantoid is scarce, which keeps it firmly in the jewellery and collector market rather than any bulk trade. Finished stones are usually under 1 carat, or 200 milligrams; cut stones above 2 carats are rare, and those above 3 carats very rare[3]. Among Russian material, the curling horsetail inclusions that mark a natural stone are sought after rather than hidden, and can raise its value when clearly visible[4]."]