[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"minerals:one:3960":3},{"id":4,"longid":5,"guid":6,"name":7,"shortcode_ima":8,"entrytype":9,"entrytype_text":10,"varietyof":8,"synid":8,"polytypeof":8,"groupid":8,"weighting":11,"nolocadd":12,"blacklisted":13,"mindat_formula":8,"mindat_formula_note":8,"ima_formula":8,"elements":8,"sigelements":8,"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":14,"strunz10ed2":14,"strunz10ed3":14,"strunz10ed4":8,"dana8ed1":14,"dana8ed2":14,"dana8ed3":14,"dana8ed4":14,"csystem":15,"cclass":8,"spacegroup":8,"spacegroupset":14,"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":12,"commentcrystal":8,"twinning":8,"tranglide":8,"parting":8,"epitaxidescription":8,"morphology":8,"tlform":8,"hmin":16,"hmax":16,"hardtype":8,"vhnmin":8,"vhnmax":8,"vhnerror":8,"vhng":8,"vhns":8,"commenthard":8,"dmeas":14,"dmeas2":14,"dcalc":8,"dmeaserror":8,"dcalcerror":8,"commentdense":8,"lustre":17,"lustretype":17,"commentluster":8,"diapheny":8,"streak":8,"colour":18,"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":14,"opticalalphaerror":8,"opticalbeta":8,"opticalbeta2":14,"opticalbetaerror":8,"opticalgamma":8,"opticalgamma2":14,"opticalgammaerror":8,"opticalomega":8,"opticalomega2":14,"opticalomegaerror":8,"opticalepsilon":8,"opticalepsilon2":14,"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":8,"rock_parent":8,"rock_parent2":8,"rock_root":9,"rock_bgs_code":8,"meteoritical_code":8,"updttime":19,"reviewed_at":8,"variety_of":8,"varieties":20,"group_members":29,"associates":30,"confused_with":31,"type_localities":32,"occurrence_total":33,"citations":34,"images":69,"structures":299,"synonyms":300,"language_names":307,"wikidata_qid":8,"texts":308},3960,"1:1:3960:0","21d229da-eff4-46a8-8d91-2ec4d3b6f03a","Tiger's Eye",null,0,"mineral",799,false,true,"0","Trigonal",7,"Vitreous","Yellow-brown","2025-08-11 12:14:24",[21,25],{"id":22,"name":23,"entrytype":24,"csystem":8,"ima_formula":8,"mindat_formula":8,"hmin":8,"hmax":8,"dmeas":8,"dcalc":8,"primary_image_id":8},40685,"Blue Tiger's Eye",2,{"id":26,"name":27,"entrytype":24,"csystem":8,"ima_formula":8,"mindat_formula":8,"hmin":8,"hmax":8,"dmeas":8,"dcalc":8,"primary_image_id":28},38866,"Falcon's Eye",88222,[],[],[],[],12,[35,39,43,46,51,56,60,65],{"id":36,"year":37,"html":38,"doi":8},16125727,1796,"Levaillant, F. (1796) New Travels into the Interior Parts of Africa, by way of the Cape of Good Hope, in the years 1783, 84 and 85. Volume 3, C.G. and J. Robinson, London, 383 pp.",{"id":40,"year":41,"html":42,"doi":8},16125725,1811,"Lichtenstein, H. (1811-12) Reisen im Südlichen Afrika in den Jahren 1803, 1804, 1805 und 1806. 2 vols., C. Salfeld, Berlin.",{"id":44,"year":41,"html":45,"doi":8},16125726,"Klaproth, M.H. (1811) Chemische Untersuchung des Blau-Eisensteins, vom Cap der güten Hoffnung. Gesell. Naturforsch. Freunde Berlin Magazin, 5, 72-74 and 75-76.",{"id":47,"year":48,"html":49,"doi":50},138831,2003,"Heaney, Peter J., Fisher, Donald M. (2003) New interpretation of the origin of tiger's-eye. \u003Ci>Geology\u003C\u002Fi>,  31 (4) 323 \u003Ca target='_blank' href='https:\u002F\u002Fdoi.org\u002F10.1130\u002F0091-7613(2003)031\u003C0323:niotoo>2.0.co;2'>doi:10.1130\u002F0091-7613(2003)031\u003C0323:niotoo>2.0.co;2\u003C\u002Fa>","10.1130\u002F0091-7613(2003)031\u003C0323:niotoo>2.0.co;2",{"id":52,"year":53,"html":54,"doi":55},138981,2004,"Gutzmer, Jens; Beukes, Nicolas J.; Cairncross, Bruce (2004) New interpretation of the origin of tiger's-eye: Comment and Reply: COMMENT. \u003Ci>Geology\u003C\u002Fi>,  32 (1). e44-e45 \u003Ca target='_blank' href='https:\u002F\u002Fdoi.org\u002F10.1130\u002F0091-7613-32.1.e44'>doi:10.1130\u002F0091-7613-32.1.e44\u003C\u002Fa>","10.1130\u002F0091-7613-32.1.e44",{"id":57,"year":53,"html":58,"doi":59},138982,"Heaney, Peter J.; Fisher, Donald M. (2004) New interpretation of the origin of tiger's-eye: Comment and Reply. \u003Ci>Geology\u003C\u002Fi>,  32 (1). e45 \u003Ca target='_blank' href='https:\u002F\u002Fdoi.org\u002F10.1130\u002F0091-7613-32.1.e45'>doi:10.1130\u002F0091-7613-32.1.e45\u003C\u002Fa>","10.1130\u002F0091-7613-32.1.e45",{"id":61,"year":62,"html":63,"doi":64},749840,2016,"Rasmeni, S., Chetty, D., Sebola, P., Seripe, K. (2016) Tiger's eye in the Northern Cape Province, South Africa - grading, distribution, small-scale mining, and beneficiation potential. \u003Ci>Journal of the Southern African Institute of Mining and Metallurgy\u003C\u002Fi>,  116 (6). 587-592 \u003Ca target='_blank' href='https:\u002F\u002Fdoi.org\u002F10.17159\u002F2411-9717\u002F2016\u002Fv116n6a15'>doi:10.17159\u002F2411-9717\u002F2016\u002Fv116n6a15\u003C\u002Fa>","10.17159\u002F2411-9717\u002F2016\u002Fv116n6a15",{"id":66,"year":67,"html":68,"doi":8},16125728,2018,"Master, S. (2018) The discovery and description of crocidolite and pseudocrocidolite (tiger’s eye) from the Northern Cape (1784 - 1811). Geocongress 2018. Geological Society of South Africa Biannual congress, University of Johannesburg 18-20 July, 2018. Abstract, page 93.",[70,79,86,96,101,111,116,121,126,135,141,149,158,167,175,184,194,203,211,220,227,235,244,253,262,267,276,284,291],{"id":71,"source_url":72,"license_code":73,"credit_html":74,"title":75,"description":76,"author":77,"original_width":78,"original_height":78},24190,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=870583","Public domain","Mitchell Gore (Lestatdelc at en.wikipedia), via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=870583\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Tigers-Eye.jpg","A cabochon of tiger's eye","Mitchell Gore (Lestatdelc at en.wikipedia)",283,{"id":80,"source_url":81,"license_code":82,"credit_html":83,"title":7,"description":8,"author":8,"original_width":84,"original_height":85},30841,"https:\u002F\u002Fgeocollections.info\u002Ffile\u002F93079","CC BY-SA 4.0","Photo: Unknown author — http:\u002F\u002Fcreativecommons.org\u002Flicenses\u002Fby-sa\u002F4.0\u002F, courtesy of \u003Ca href=\"https:\u002F\u002Fgeocollections.info\u002Ffile\u002F93079\" rel=\"noopener\">The Estonian Museum of Natural History\u003C\u002Fa> via Europeana",969,1000,{"id":87,"source_url":88,"license_code":89,"credit_html":90,"title":91,"description":92,"author":93,"original_width":94,"original_height":95},24191,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=47819653","CC BY 3.0","Photolitherland at English Wikipedia, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=47819653\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Tiger's eye 3.jpg","Tiger's eye","Photolitherland at English Wikipedia",888,573,{"id":97,"source_url":98,"license_code":82,"credit_html":99,"title":7,"description":8,"author":8,"original_width":85,"original_height":100},30842,"https:\u002F\u002Fgeocollections.info\u002Ffile\u002F61195","Photo: Unknown author — http:\u002F\u002Fcreativecommons.org\u002Flicenses\u002Fby-sa\u002F4.0\u002F, courtesy of \u003Ca href=\"https:\u002F\u002Fgeocollections.info\u002Ffile\u002F61195\" rel=\"noopener\">The Estonian Museum of Natural History\u003C\u002Fa> via Europeana",750,{"id":102,"source_url":103,"license_code":104,"credit_html":105,"title":106,"description":107,"author":108,"original_width":109,"original_height":110},82932,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=2842599","CC BY-SA 3.0","“Jon Zander (Digon3)”, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=2842599\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Polished Tiger's eye Macro.JPG","Macro of polished Tigers-eye.","“Jon Zander (Digon3)”",1892,1312,{"id":112,"source_url":113,"license_code":82,"credit_html":114,"title":7,"description":8,"author":8,"original_width":115,"original_height":85},30843,"https:\u002F\u002Fgeocollections.info\u002Ffile\u002F93087","Photo: Unknown author — http:\u002F\u002Fcreativecommons.org\u002Flicenses\u002Fby-sa\u002F4.0\u002F, courtesy of \u003Ca href=\"https:\u002F\u002Fgeocollections.info\u002Ffile\u002F93087\" rel=\"noopener\">The Estonian Museum of Natural History\u003C\u002Fa> via Europeana",827,{"id":117,"source_url":118,"license_code":82,"credit_html":119,"title":7,"description":8,"author":8,"original_width":85,"original_height":120},30844,"https:\u002F\u002Fgeocollections.info\u002Ffile\u002F93048","Photo: Unknown author — http:\u002F\u002Fcreativecommons.org\u002Flicenses\u002Fby-sa\u002F4.0\u002F, courtesy of \u003Ca href=\"https:\u002F\u002Fgeocollections.info\u002Ffile\u002F93048\" rel=\"noopener\">The Estonian Museum of Natural History\u003C\u002Fa> via Europeana",406,{"id":122,"source_url":123,"license_code":82,"credit_html":124,"title":7,"description":8,"author":8,"original_width":125,"original_height":85},30845,"https:\u002F\u002Fgeocollections.info\u002Ffile\u002F93078","Photo: Unknown author — http:\u002F\u002Fcreativecommons.org\u002Flicenses\u002Fby-sa\u002F4.0\u002F, courtesy of \u003Ca href=\"https:\u002F\u002Fgeocollections.info\u002Ffile\u002F93078\" rel=\"noopener\">The Estonian Museum of Natural History\u003C\u002Fa> via Europeana",809,{"id":127,"source_url":128,"license_code":82,"credit_html":129,"title":130,"description":131,"author":132,"original_width":133,"original_height":134},24195,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=154878171","Mauro Cateb, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=154878171\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Tiger's eye - A.jpg","Three tiger's eye cabochons","Mauro Cateb",1472,1145,{"id":136,"source_url":137,"license_code":138,"credit_html":139,"title":7,"description":8,"author":8,"original_width":85,"original_height":140},30846,"https:\u002F\u002Fgeocollections.info\u002Ffile\u002F112349","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\u002F112349\" rel=\"noopener\">Department of Geology, TalTech\u003C\u002Fa> via Europeana",666,{"id":142,"source_url":143,"license_code":89,"credit_html":144,"title":145,"description":92,"author":146,"original_width":147,"original_height":148},54193,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=10673194","Doronenko, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=10673194\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","2010 - tigers eye.jpg","Doronenko",2436,1894,{"id":150,"source_url":151,"license_code":82,"credit_html":152,"title":153,"description":154,"author":155,"original_width":156,"original_height":157},54194,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=11309559","Adam Ognisty, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=11309559\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Bębnówka tygrysie oko.jpg","bębnówka tygrysiego oka, RPA","Adam Ognisty",800,600,{"id":159,"source_url":160,"license_code":104,"credit_html":161,"title":162,"description":163,"author":164,"original_width":165,"original_height":166},82933,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=18553530","Veronika Ronkos, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=18553530\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Tiger's eye red 3D.jpg","Red tiger's eye in 3D. \ncross eyes to see","Veronika Ronkos",1022,427,{"id":168,"source_url":169,"license_code":104,"credit_html":170,"title":171,"description":172,"author":155,"original_width":173,"original_height":174},54196,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=30519818","Adam Ognisty, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=30519818\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","1tygrysie oko.jpg","Tygrysie oko, kula o średnicy 78mm, waga 775g, RPA",1920,1440,{"id":176,"source_url":177,"license_code":73,"credit_html":178,"title":179,"description":180,"author":181,"original_width":182,"original_height":183},54201,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=105023308","Los688, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=105023308\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Tiger's eye.JPG","タイガーズアイ、虎目石。南アフリカ産。","Los688",664,441,{"id":185,"source_url":186,"license_code":187,"credit_html":188,"title":189,"description":190,"author":191,"original_width":192,"original_height":193},24192,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=99541367","CC BY 2.0","James St. John, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=99541367\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Tiger's eye quartz 11.jpg","Tiger's eye quartz (rough; ~5.0 centimeters across at its widest)\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 over 5600 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>The simplest & most abundant silicate mineral in the Earth's crust is quartz (SiO2).  All other silicates have silica + impurities.  Many silicates have a significant percentage of aluminum (the aluminosilicates).\n\u003C\u002Fp>\u003Cp>Quartz (silicon dioxide\u002Fsilica - SiO2) is the most common mineral in the Earth's crust.  It is composed of the two most abundant elements in the crust - oxygen and silicon.  It has a glassy, nonmetallic luster, is commonly clearish to whitish to grayish in color, has a white streak, is quite hard (H≡7), forms hexagonal crystals, has no cleavage, and has conchoidal fracture.  Quartz can be any color: clear, white, gray, black, brown, pink, red, purple, blue, green, orange, etc.\n\u003C\u002Fp>\u003Cp>The specimen seen here is tiger's eye, a distinctive and attractive, semi-precious variety of quartz consisting of closely-packed, straight to slightly wavy fibers of quartz.  The yellowish-brown coloration is apparently due to limonite (= hydrous iron hydroxy-oxide).  Tiger's eye quartz has chatoyancy - tilting the specimen in bright light results in an optical effect of moving colors and varying light intensity.\n\u003C\u002Fp>\u003Cp>Tiger's eye quartz is traditionally hypothesized to have formed by quartz and limonite replacement of asbestiform amphibole.  Another hypothesis, proposed in the 2000s, suggests that the quartz fibers grew perpendicular to the walls of a slowly-dilating fracture.\n\u003C\u002Fp>\n\u003Chr>\n\u003Cp>Photo gallery of tiger's eye quartz:\n\u003C\u002Fp>\nwww.mindat.org\u002Fgallery.php?min=3960","James St. John",2269,1695,{"id":195,"source_url":196,"license_code":104,"credit_html":197,"title":198,"description":199,"author":200,"original_width":201,"original_height":202},54189,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=4316352","Benjamint444, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=4316352\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Tigers eye crystal444.jpg","Tigers eye quartz","Benjamint444",1638,1024,{"id":204,"source_url":205,"license_code":187,"credit_html":206,"title":207,"description":208,"author":191,"original_width":209,"original_height":210},24193,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=99541370","James St. John, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=99541370\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Tiger's eye quartz 10.jpg","Tiger's eye quartz (rough; ~3.7 centimeters across at its widest)\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 over 5600 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>The simplest & most abundant silicate mineral in the Earth's crust is quartz (SiO2).  All other silicates have silica + impurities.  Many silicates have a significant percentage of aluminum (the aluminosilicates).\n\u003C\u002Fp>\u003Cp>Quartz (silicon dioxide\u002Fsilica - SiO2) is the most common mineral in the Earth's crust.  It is composed of the two most abundant elements in the crust - oxygen and silicon.  It has a glassy, nonmetallic luster, is commonly clearish to whitish to grayish in color, has a white streak, is quite hard (H≡7), forms hexagonal crystals, has no cleavage, and has conchoidal fracture.  Quartz can be any color: clear, white, gray, black, brown, pink, red, purple, blue, green, orange, etc.\n\u003C\u002Fp>\u003Cp>The specimen seen here is tiger's eye, a distinctive and attractive, semi-precious variety of quartz consisting of closely-packed, straight to slightly wavy fibers of quartz.  The yellowish-brown coloration is apparently due to limonite (= hydrous iron hydroxy-oxide).  Tiger's eye quartz has chatoyancy - tilting the specimen in bright light results in an optical effect of moving colors and varying light intensity.\n\u003C\u002Fp>\u003Cp>Tiger's eye quartz is traditionally hypothesized to have formed by quartz and limonite replacement of asbestiform amphibole.  Another hypothesis, proposed in the 2000s, suggests that the quartz fibers grew perpendicular to the walls of a slowly-dilating fracture.\n\u003C\u002Fp>\n\u003Chr>\n\u003Cp>Photo gallery of tiger's eye quartz:\n\u003C\u002Fp>\nwww.mindat.org\u002Fgallery.php?min=3960",1693,2362,{"id":212,"source_url":213,"license_code":104,"credit_html":214,"title":215,"description":216,"author":217,"original_width":218,"original_height":219},54190,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=5845309","Ra'ike (see also: de:Benutzer:Ra'ike), via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=5845309\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Quartz - Tigers-Eye - raw stone from Southafrica.jpg","Quartz - Tigers-Eye, raw stone from Southafrica","Ra'ike (see also: de:Benutzer:Ra'ike)",2300,1500,{"id":221,"source_url":222,"license_code":187,"credit_html":223,"title":224,"description":190,"author":191,"original_width":225,"original_height":226},24194,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=99541374","James St. John, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=99541374\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Tiger's eye quartz 8.jpg",2281,2644,{"id":228,"source_url":229,"license_code":104,"credit_html":230,"title":231,"description":232,"author":217,"original_width":233,"original_height":234},54191,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=5931440","Ra'ike (see also: de:Benutzer:Ra'ike), via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=5931440\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Quarz - Tigerauge.jpg","Quartzvariety \u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FTiger%27s_Eye\" class=\"extiw\" title=\"en:Tiger's Eye\">Tiger's Eye\u003C\u002Fa>",2500,1600,{"id":236,"source_url":237,"license_code":73,"credit_html":238,"title":239,"description":240,"author":241,"original_width":242,"original_height":243},54192,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=6206388","Unnameduploads, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=6206388\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Tigers eye egg shape.jpg","Tiger's eye gemstone as an egg shape with some iron stripes on it.","Unnameduploads",2138,1620,{"id":245,"source_url":246,"license_code":82,"credit_html":247,"title":248,"description":249,"author":250,"original_width":251,"original_height":252},24185,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=9099863","Marek Novotnak, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=9099863\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Tiger's eye.jpg","Gemstone that is usually a metamorphic rock that is yellow- to red-brown.","Marek Novotnak",3365,2676,{"id":254,"source_url":255,"license_code":82,"credit_html":256,"title":257,"description":258,"author":259,"original_width":260,"original_height":261},24196,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=157393719","W.carter, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=157393719\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Egg-shaped tiger's eye quartz 1.jpg","Egg-shaped golden brown tiger's eye quartz, about 2.5 cm long. Studio photography in Vibble, Visby, Gotland, Sweden.","W.carter",2731,2049,{"id":263,"source_url":264,"license_code":82,"credit_html":265,"title":266,"description":258,"author":259,"original_width":260,"original_height":261},24197,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=157393720","W.carter, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=157393720\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Egg-shaped tiger's eye quartz 2.jpg",{"id":268,"source_url":269,"license_code":104,"credit_html":270,"title":271,"description":272,"author":273,"original_width":274,"original_height":275},51096,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=10176774","Robert M. Lavinsky, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=10176774\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Tigers-Eye-Riebeckite-Hematite-214889.jpg","\u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FTiger%27s_Eye\" class=\"extiw\" title=\"en:Tiger's Eye\">Tiger's Eye\u003C\u002Fa>, \u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FRiebeckite\" class=\"extiw\" title=\"en:Riebeckite\">Riebeckite\u003C\u002Fa> (Var.: \u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FRiebeckite\" class=\"extiw\" title=\"en:Riebeckite\">Riebeckite\u003C\u002Fa>), \u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FHematite\" class=\"extiw\" title=\"en:Hematite\">Hematite\u003C\u002Fa>\n\u003Cdl>\u003Cdd>\u003Cdl>\u003Cdd>Locality: \u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FAtikokan\" class=\"extiw\" title=\"en:Atikokan\">Atikokan\u003C\u002Fa>, Hutchinson Township, Rainy River District, \u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FOntario\" class=\"extiw\" title=\"en:Ontario\">Ontario\u003C\u002Fa>, Canada (\u003Ca rel=\"nofollow\" class=\"external text\" href=\"http:\u002F\u002Fwww.mindat.org\u002Floc-529.html\">Locality at mindat.org\u003C\u002Fa>)\u003C\u002Fdd>\n\u003Cdd>Size: 11.7 x 9.4 x 8.8 cm.\u003C\u002Fdd>\n\u003Cdd>A really strange, very showy double pseudomorph cabinet specimen from Ontario. This unique, highly lustrous, mushroom-shaped pseudo is quartz variety classically banded Tiger Eye after crocidolite (a fibrous asbestos mineral) after classic, hematite kidney ore. The \"mushroom\" cap of pseudomorphed hematite kidney ore sits atop the stem of beautiful, banded, fibrous, Tiger Eye. I have never seen anything quite like it. Not even another from the same place. It strikes me as a real oddity.\u003C\u002Fdd>\u003C\u002Fdl>\u003C\u002Fdd>\u003C\u002Fdl>","Robert M. Lavinsky",700,614,{"id":277,"source_url":278,"license_code":187,"credit_html":279,"title":280,"description":281,"author":191,"original_width":282,"original_height":283},82934,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=84500355","James St. John, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=84500355\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Tiger's eye quartz 4 (23829732706).jpg","\u003Cp>Tiger's eye quartz (polished)\n\u003C\u002Fp>\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 5400 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>The simplest & most abundant silicate mineral in the Earth's crust is quartz (SiO2).  All other silicates have silica + impurities.  Many silicates have a significant percentage of aluminum (the aluminosilicates).\n\u003C\u002Fp>\u003Cp>Quartz (silicon dioxide\u002Fsilica - SiO2) is the most common mineral in the Earth's crust.  It is composed of the two most abundant elements in the crust - oxygen and silicon.  It has a glassy, nonmetallic luster, is commonly clearish to whitish to grayish in color, has a white streak, is quite hard (H≡7), forms hexagonal crystals, has no cleavage, and has conchoidal fracture.  Quartz can be any color: clear, white, gray, black, brown, pink, red, purple, blue, green, orange, etc.\n\u003C\u002Fp>\u003Cp>The specimen shown above is tiger's eye, a distinctive and attractive, semi-precious variety of quartz consisting of closely-packed, straight to slightly wavy fibers of quartz.  The yellowish coloration is apparently due to limonite (= hydrous iron hydroxy-oxide).  Tiger's eye quartz has chatoyancy - tilting the specimen in bright light results in an optical effect of moving colors and varying light intensity.\n\u003C\u002Fp>\u003Cp>Tiger's eye quartz is traditionally hypothesized to have formed by quartz and limonite replacement of asbestiform amphibole.  Another hypothesis, proposed in the 2000s, suggests that the quartz fibers grew perpendicular to the walls of a slowly-dilating fracture.\n\u003C\u002Fp>\n\u003Chr>\n\u003Cp>Photo gallery of tiger's eye quartz:\n\u003C\u002Fp>\n<a href=\"\u003Ca rel=\"nofollow\" class=\"external free\" href=\"http:\u002F\u002Fwww.mindat.org\u002Fgallery.php?min=3960\">http:\u002F\u002Fwww.mindat.org\u002Fgallery.php?min=3960\u003C\u002Fa>\" rel=\"nofollow\">www.mindat.org\u002Fgallery.php?min=3960<\u002Fa>",2074,1445,{"id":285,"source_url":286,"license_code":187,"credit_html":287,"title":288,"description":281,"author":191,"original_width":289,"original_height":290},54199,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=84500357","James St. John, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=84500357\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Tiger's eye quartz 3 (23773342581).jpg",1982,1401,{"id":292,"source_url":293,"license_code":187,"credit_html":294,"title":295,"description":296,"author":191,"original_width":297,"original_height":298},54200,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=84500551","James St. John, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=84500551\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Tiger's eye quartz 5 (31732138483).jpg","\u003Cp>Tiger's eye quartz (polished)\n\u003C\u002Fp>\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 5400 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>The simplest & most abundant silicate mineral in the Earth's crust is quartz (SiO2).  All other silicates have silica + impurities.  Many silicates have a significant percentage of aluminum (the aluminosilicates).\n\u003C\u002Fp>\u003Cp>Quartz (silicon dioxide\u002Fsilica - SiO2) is the most common mineral in the Earth's crust.  It is composed of the two most abundant elements in the crust - oxygen and silicon.  It has a glassy, nonmetallic luster, is commonly clearish to whitish to grayish in color, has a white streak, is quite hard (H≡7), forms hexagonal crystals, has no cleavage, and has conchoidal fracture.  Quartz can be any color: clear, white, gray, black, brown, pink, red, purple, blue, green, orange, etc.\n\u003C\u002Fp>\u003Cp>The specimen shown above is tiger's eye, a distinctive and attractive, semi-precious variety of quartz consisting of closely-packed, straight to slightly wavy fibers of quartz.  The yellowish-brown coloration is apparently due to limonite (= hydrous iron hydroxy-oxide).  Tiger's eye quartz has chatoyancy - tilting the specimen in bright light results in an optical effect of moving colors and varying light intensity.\n\u003C\u002Fp>\u003Cp>Tiger's eye quartz is traditionally hypothesized to have formed by quartz and limonite replacement of asbestiform amphibole.  Another hypothesis, proposed in the 2000s, suggests that the quartz fibers grew perpendicular to the walls of a slowly-dilating fracture.\n\u003C\u002Fp>\n\u003Chr>\n\u003Cp>Photo gallery of tiger's eye quartz:\n\u003C\u002Fp>\n<a href=\"\u003Ca rel=\"nofollow\" class=\"external free\" href=\"http:\u002F\u002Fwww.mindat.org\u002Fgallery.php?min=3960\">http:\u002F\u002Fwww.mindat.org\u002Fgallery.php?min=3960\u003C\u002Fa>\" rel=\"nofollow\">www.mindat.org\u002Fgallery.php?min=3960<\u002Fa>",860,678,[],[301,302,303,304,305,306],"Oeil-de-tigre","Ojo de Tigre","Pseudocrocidolite","Tiger Eye","Tigerauge","Tigerøye",[],{"history":8,"applications":8}]