[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"minerals:one:1473":3},{"id":4,"longid":5,"guid":6,"name":7,"shortcode_ima":8,"entrytype":9,"entrytype_text":10,"varietyof":11,"synid":11,"polytypeof":11,"groupid":11,"weighting":12,"nolocadd":13,"blacklisted":13,"mindat_formula":14,"mindat_formula_note":11,"ima_formula":14,"elements":15,"sigelements":19,"key_elements":11,"impurities":11,"cim":20,"ima_status":21,"ima_notes":11,"ima_history":11,"approval_year":11,"publication_year":23,"discovery_year":24,"strunz10ed1":25,"strunz10ed2":26,"strunz10ed3":27,"strunz10ed4":28,"dana8ed1":29,"dana8ed2":30,"dana8ed3":25,"dana8ed4":31,"csystem":32,"cclass":33,"spacegroup":34,"spacegroupset":35,"a":36,"b":37,"c":38,"alpha":37,"beta":37,"gamma":37,"aerror":11,"berror":11,"cerror":11,"alphaerror":11,"betaerror":11,"gammaerror":11,"va3":11,"z":39,"csmetamict":13,"commentcrystal":40,"twinning":11,"tranglide":11,"parting":11,"epitaxidescription":11,"morphology":41,"tlform":42,"hmin":11,"hmax":11,"hardtype":11,"vhnmin":37,"vhnmax":37,"vhnerror":11,"vhng":11,"vhns":11,"commenthard":11,"dmeas":11,"dmeas2":37,"dcalc":43,"dmeaserror":11,"dcalcerror":11,"commentdense":44,"lustre":11,"lustretype":45,"commentluster":11,"diapheny":46,"streak":47,"colour":48,"commentcolor":11,"colors":49,"streak_colors":52,"luminescence":11,"uv":53,"cleavage":11,"cleavagetype":11,"fracturetype":11,"tenacity":54,"commentbreak":11,"opticaltype":55,"opticalsign":56,"opticalalpha":37,"opticalalpha2":37,"opticalalphaerror":11,"opticalbeta":37,"opticalbeta2":37,"opticalbetaerror":11,"opticalgamma":37,"opticalgamma2":37,"opticalgammaerror":11,"opticalomega":57,"opticalomega2":37,"opticalomegaerror":11,"opticalepsilon":58,"opticalepsilon2":37,"opticalepsilonerror":11,"opticaln":37,"opticaln2":37,"opticalnerror":11,"optical2vcalc":37,"optical2vcalc2":37,"optical2vcalcerror":11,"optical2vmeasured":37,"optical2vmeasured2":37,"optical2vmeasurederror":11,"rimin":59,"rimax":60,"opticaldispersion":11,"opticalpleochroism":11,"opticalpleochorismdesc":11,"opticalbirefringence":61,"opticalcomments":11,"opticalcolour":11,"opticalinternal":11,"opticaltropic":11,"opticalanisotropism":11,"opticalbireflectance":11,"opticalextinction":11,"opticalr":11,"specdispm":11,"ir":11,"electrical":11,"magnetism":11,"thermalbehaviour":11,"other":11,"industrial":11,"occurrence":62,"otheroccurrence":11,"type_specimen_store":11,"description_short":63,"aboutname":64,"rock_parent":11,"rock_parent2":11,"rock_root":9,"rock_bgs_code":11,"meteoritical_code":11,"updttime":65,"reviewed_at":11,"variety_of":11,"varieties":66,"group_members":67,"associates":68,"confused_with":69,"type_localities":86,"occurrence_total":93,"citations":94,"images":153,"structures":164,"synonyms":171,"language_names":173,"wikidata_qid":193,"texts":194},1473,"1:1:1473:7","261dc517-359c-4c41-9ee6-72b81b36c7ca","Feitknechtite","Fkn",0,"mineral",null,114,false,"Mn\u003Csup>3+\u003C\u002Fsup>O(OH)",[16,17,18],"Mn","O","H",[16,17,18],"7.18.6",[22],"APPROVED",1965,"1965","4","F","E","25","6","1","3","Trigonal",13,97,"P-3m1 ","3.32","0","4.71",1,"Space group for synthetic material. Note: the structure of another synthetic material (Post et al. 2023) is monoclinic, space group C2\u002Fm, a=5.6541(4), b=2.89075(2), c=4.8347(3) Å, β=108.0709(1) deg.","Hexagonal platelets; granular, earthy.","Black replacement of pyrochroite. May show trigonal platy appearance.","3.249","ICDD lists D (measured and calculated) = 3.80. Could be an error","Resinous,Sub-Metallic,Dull,Earthy","Opaque","brown","Lead-gray, brownish black",[50,51,47],"gray","black",[47],"Not fluorescent in ultraviolet","brittle","Uniaxial","-","2.055","1.950",1.95,2.055,"0.105","Gossan zone of a manganiferous marble-hosted ","Black replacement of pyrochroite that yielded a mixture of hausmannite and feitknechtite. A specimen of black pyrochroite from the type locality was submitted to the RRUFF Project for Raman spectroscopic examination. Pyrochroite was detected, but not h...","Named in 1965 by Owen P. Brickner in honor of Walter Feitknecht [December 14, 1899 Schüpfen, Switzerland - 1975 Bern, Switzerland], systematic researcher relating to manganese oxide minerals and professor of Chemistry, University of Bern, Bern, Switzerland and who first synthesized the compound.","2025-08-11 12:14:20",[],[],[],[70,79],{"id":71,"name":72,"entrytype":9,"csystem":73,"ima_formula":14,"mindat_formula":14,"hmin":74,"hmax":75,"dmeas":76,"dcalc":77,"primary_image_id":78},1756,"Groutite","Orthorhombic",3.5,4,"4.144","4.172",10513,{"id":80,"name":81,"entrytype":9,"csystem":82,"ima_formula":14,"mindat_formula":14,"hmin":75,"hmax":75,"dmeas":83,"dcalc":84,"primary_image_id":85},2519,"Manganite","Monoclinic","4.29","4.38",15298,[87],{"id":88,"txt":89,"latitude":90,"longitude":91,"country":92},8541,"Franklin Mine, Franklin, Sussex County, New Jersey, USA",41.1158333,-74.5875,"USA",15,[95,100,104,109,112,116,120,125,130,134,138,143,148],{"id":96,"year":97,"html":98,"doi":99},3263724,1945,"Feitknecht, W., Marti, W. (1945) Über die Oxydation von Mangan(II)-hydroxyd mit molekularem Sauerstoff. \u003Ci>Helvetica Chimica Acta\u003C\u002Fi>, 28 (1). 129-148 \u003Ca target='_blank' href='https:\u002F\u002Fdoi.org\u002F10.1002\u002Fhlca.19450280113'>doi:10.1002\u002Fhlca.19450280113\u003C\u002Fa>","10.1002\u002Fhlca.19450280113",{"id":101,"year":102,"html":103,"doi":11},522394,1953,"Frondel, Clifford (1953) New manganese oxides: hydrohausmannite and woodruffite. \u003Ci>American Mineralogist\u003C\u002Fi>,  38 (9-10) 761-769 \u003Ca target='_blank' href='http:\u002F\u002Fwww.minsocam.org\u002Fammin\u002FAM38\u002FAM38_761.pdf' class='refpdflink'>\u003C\u002Fa>",{"id":105,"year":106,"html":107,"doi":108},16592764,1962,"Feitknecht, W., Brunner, P., Oswaldw, H. R. (1962) Über den Einfluß der Feuchtigkeit auf die Oxydation von Manganhydroxid durch molekularen Sauerstoff. \u003Ci>Zeitschrift für anorganische und allgemeine Chemie\u003C\u002Fi>,  316 (3). 154-160 \u003Ca target='_blank' href='https:\u002F\u002Fdoi.org\u002F10.1002\u002Fzaac.19623160307'>doi:10.1002\u002Fzaac.19623160307\u003C\u002Fa>","10.1002\u002Fzaac.19623160307",{"id":110,"year":23,"html":111,"doi":11},524336,"Bricker, Owen P. (1965) Some stability relations in the system Mn-O2-H2O at 25° and one atmosphere total pressure. \u003Ci>American Mineralogist\u003C\u002Fi>,  50 (9) 1296-1354 \u003Ca target='_blank' href='http:\u002F\u002Fwww.minsocam.org\u002Fammin\u002FAM50\u002FAM50_1296.pdf' class='refpdflink'>\u003C\u002Fa>",{"id":113,"year":114,"html":115,"doi":11},16109034,1969,"Nambu, M., Tanida, K., Kitamura, T., Komura, T. (1969) Feitknechtite and its origin from Noda-Tamagawa mine, Iwate Prefecture, Japan. Ganseki Kobutsu Kosho Gakkaishi: 59(3): 91–107 (in Japanese).",{"id":117,"year":118,"html":119,"doi":11},16109035,1970,"(1970) Chemical Absracts: 72: 121 (abs. ref. 3).",{"id":121,"year":122,"html":123,"doi":124},5731132,1973,"Meldau, R., Newesely, H., Strunz, H. (1973) Zur Kristallchemie von Feitknechtit, β-MnOOH. \u003Ci>Die Naturwissenschaften\u003C\u002Fi>,  60 (8). 387 \u003Ca target='_blank' href='https:\u002F\u002Fdoi.org\u002F10.1007\u002Fbf00602514'>doi:10.1007\u002Fbf00602514\u003C\u002Fa>","10.1007\u002Fbf00602514",{"id":126,"year":127,"html":128,"doi":129},16109037,1996,"Luo, J., Segal, S. R., Wang, J. Y., Tian, Z. R., Suib, S. L. (1996) Synthesis, Characterization, and Reactivity of Feitknechtite. \u003Ci>MRS Proceedings\u003C\u002Fi>,  431 (3). 8 \u003Ca target='_blank' href='https:\u002F\u002Fdoi.org\u002F10.1557\u002Fproc-431-3'>doi:10.1557\u002Fproc-431-3\u003C\u002Fa>","10.1557\u002Fproc-431-3",{"id":131,"year":132,"html":133,"doi":11},16964219,2005,"(2005) Feitknechtite. \u003Ci>Handbook of Mineralogy\u003C\u002Fi>. Mineralogical Society of America \u003Ca target='_blank' href='https:\u002F\u002Fwww.handbookofmineralogy.org\u002Fpdfs\u002Ffeitknechtite.pdf' class='refpdflink'>\u003C\u002Fa>",{"id":135,"year":136,"html":137,"doi":11},16109038,2007,"Roth P (2007) Feitknechtite. in Minerals first discovered in Switzerland and minerals named after Swiss individuals, Kristallografik Verlag (Achberg Germany): 180-181.",{"id":139,"year":140,"html":141,"doi":142},129624,2017,"Grangeon, Sylvain, Warmont, Fabienne, Tournassat, Christophe, Lanson, Bruno, Lanson, Martine, Elkaïm, Erik, Claret, Francis (2017) Nucleation and growth of feitknechtite from nanocrystalline vernadite precursor. \u003Ci>European Journal of Mineralogy\u003C\u002Fi>,  29 (4) 767-776 \u003Ca target='_blank' href='https:\u002F\u002Fdoi.org\u002F10.1127\u002Fejm\u002F2017\u002F0029-2665'>doi:10.1127\u002Fejm\u002F2017\u002F0029-2665\u003C\u002Fa>","10.1127\u002Fejm\u002F2017\u002F0029-2665",{"id":144,"year":145,"html":146,"doi":147},16908928,2023,"Post, Jeffrey E., Heaney, Peter J., Ilton, Eugene S., Elzinga, Evert J. (2023) The crystal structure of feitknechtite (β-MnOOH) and a new MnOOH polymorph. \u003Ci>American Mineralogist\u003C\u002Fi>,  108 (11) 2131-2141 \u003Ca target='_blank' href='https:\u002F\u002Fdoi.org\u002F10.2138\u002Fam-2022-8729'>doi:10.2138\u002Fam-2022-8729\u003C\u002Fa>","10.2138\u002Fam-2022-8729",{"id":149,"year":150,"html":151,"doi":152},17234885,2024,"Tani, Yukinori, Kumagai, Hanako, Tamari, Mako, Umezawa, Kazuhiro, Gotore, Obey, Miyata, Naoyuki (2024) Mineralization of Ni2+-Bearing Mn Oxide through Simultaneous Sequestration of Ni2+ and Mn2+ by Enzymatically Active Fungal Mn Oxides. \u003Ci>Minerals\u003C\u002Fi>,  14 (4) 330 \u003Ca target='_blank' href='https:\u002F\u002Fdoi.org\u002F10.3390\u002Fmin14040330'>doi:10.3390\u002Fmin14040330\u003C\u002Fa>","10.3390\u002Fmin14040330",[154],{"id":155,"source_url":156,"license_code":157,"credit_html":158,"title":159,"description":160,"author":161,"original_width":162,"original_height":163},8418,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=170419308","CC BY 4.0","David Hospital, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=170419308\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Feitknechtite & Rhodonite.jpg","Grey brownish aggregates of the very rare Mn mineral feitknechtite associated to pinkish rhodonite from Japan (Fujii Mine, Wakasa-cho, Mikatakaminaka District, Fukui Prefecture, Honshu Island, Japan). Ex Vandenbroucke Museum collection from Waregem, Belgium.","David Hospital",563,527,[165],{"id":166,"url":167,"label":168,"formula":169,"spacegroup":170,"year":145},4448,"\u002Fcif\u002F4448.cif","Post 2023","Mn (O2 H)","C 1 2\u002Fm 1",[172],"Feitknechtiet",[174,178,182,186,189],{"lang":175,"names":176},"ca",[177],"feitknechtita",{"lang":179,"names":180},"de",[181],"Feitknechtit",{"lang":183,"names":184},"eu",[185,7],"Feitknechtita",{"lang":187,"names":188},"it",[7],{"lang":190,"names":191},"zh",[192],"六方水锰矿","Q3742061",{"history":11,"applications":11}]