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Also, massive, fine-grained to fibrous aggregates up to 1 cm in length.",3,"105",20,"VHN,50g = 115 kg\u002Fmm3","3.05","3.00",10,"Measured using heavy liquids","Vitreous,Pearly","Transparent","White","Very faint rose-red color. Isolated crystals appear almost colorless.",[63,64,65],"pink","colorless","white",[65],"None","Parallel to {010}","Perfect","very brittle","Biaxial","-","1.601","1.630","1.660","88","89",1.601,1.66,"none","Weak","Very weakly visible in thicker crystals, colorless to rose-red.","X ~ b, Y ~ a, Z ~ c. On {010}: Z Λ c~ 15°, on {100}: Z Λ c~ 6°, X almost normal to {010}.","Z > Y ~ X.","cm-1, transmittance in percent:\r\n3428 (27.6), 1643 (74.5), 824 (27.6),714 (61.1), 400 (48.3), and 370 (47.3).","Alpine metamorphism of manganese ores, with abundant As in surrounding rock","Natural History Museum, Basel, and at the Mineralogical Institute, University of Basel.","The manganese analogue of chudobaite.","Named after Dr. Thomas Geiger (1920 - 1990), Swiss mineralogist and metallurgist in the machinery industry and specialist for the manganese ores and minerals of Falotta and Alp Parsettens to which he devoted his PhD thesis and a series of later studies.","2026-03-11 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2H\u003Csub>2\u003C\u002Fsub>O","Ca\u003Csub>2\u003C\u002Fsub>Mn\u003Csup>2+\u003C\u002Fsup>(AsO\u003Csub>4\u003C\u002Fsub>)\u003Csub>2\u003C\u002Fsub>·2H\u003Csub>2\u003C\u002Fsub>O",3.5,"3.67","3.7",3789,{"id":136,"name":137,"entrytype":9,"csystem":138,"ima_formula":139,"mindat_formula":140,"hmin":123,"hmax":123,"dmeas":141,"dcalc":142,"primary_image_id":143},1753,"Grischunite","Orthorhombic","NaCa\u003Csub>2\u003C\u002Fsub>Mn\u003Csup>2+\u003C\u002Fsup>\u003Csub>5\u003C\u002Fsub>Fe\u003Csup>3+\u003C\u002Fsup>(AsO\u003Csub>4\u003C\u002Fsub>)\u003Csub>6\u003C\u002Fsub> · 2H\u003Csub>2\u003C\u002Fsub>O","NaCa\u003Csub>2\u003C\u002Fsub>Mn\u003Csup>2+\u003C\u002Fsup>\u003Csub>5\u003C\u002Fsub>Fe\u003Csup>3+\u003C\u002Fsup>(AsO\u003Csub>4\u003C\u002Fsub>)\u003Csub>6\u003C\u002Fsub>·2H\u003Csub>2\u003C\u002Fsub>O","3.8","4.144",10483,{"id":145,"name":146,"entrytype":9,"csystem":147,"ima_formula":148,"mindat_formula":148,"hmin":149,"hmax":123,"dmeas":150,"dcalc":151,"primary_image_id":152},2480,"Manganberzeliite","Isometric","(NaCa\u003Csub>2\u003C\u002Fsub>)Mn\u003Csup>2+\u003C\u002Fsup>\u003Csub>2\u003C\u002Fsub>(AsO\u003Csub>4\u003C\u002Fsub>)\u003Csub>3\u003C\u002Fsub>",4.5,"4.28","4.38",15263,{"id":154,"name":155,"entrytype":9,"csystem":120,"ima_formula":156,"mindat_formula":156,"hmin":157,"hmax":123,"dmeas":158,"dcalc":159,"primary_image_id":160},3535,"Sarkinite","Mn\u003Csup>2+\u003C\u002Fsup>\u003Csub>2\u003C\u002Fsub>(AsO\u003Csub>4\u003C\u002Fsub>)(OH)",4,"4.08","4.04",21600,{"id":162,"name":163,"entrytype":9,"csystem":120,"ima_formula":164,"mindat_formula":164,"hmin":123,"hmax":11,"dmeas":165,"dcalc":166,"primary_image_id":167},3962,"Tilasite","CaMg(AsO\u003Csub>4\u003C\u002Fsub>)F","3.77","3.80",24199,[],[170],{"id":171,"txt":172,"latitude":173,"longitude":174,"country":175},3211,"Falotta, Tinizong (Tinzen), Surses, Albula Region, Grisons, Switzerland",46.5533333,9.6469444,"Switzerland",7,[178,181,185,189],{"id":179,"year":28,"html":180,"doi":11},528685,"Graeser, Stefan, Schwander, Hans, Pilati, Riccardo Bianchi. Tullio, Gramaccioli, Carlo Maria (1989) Geigerite, the Mn analogue of chudobaite: Its description and crystal structure. \u003Ci>American Mineralogist\u003C\u002Fi>,  74 (5-6) 676-684 \u003Ca target='_blank' href='http:\u002F\u002Fwww.minsocam.org\u002Fammin\u002FAM74\u002FAM74_676.pdf' class='refpdflink'>\u003C\u002Fa>",{"id":182,"year":183,"html":184,"doi":11},16154443,1991,"Graeser, S. (1991)  Geigerit - ein neues Mineral aus den Schweizer Alpen. Schweizer Strahler, 2, 59–75.",{"id":186,"year":187,"html":188,"doi":11},15982994,2000,"Cabella, R., Basso, R., Lucchetti, G., Palenzona, A. (2000): Geigerite from Mt. Nero manganese mine (Northern Appennines, La Spezia, Italy). Neues Jahrbuch für Mineralogie, 12, 570-576.",{"id":190,"year":191,"html":192,"doi":11},16964534,2005,"(2005) Geigerite. \u003Ci>Handbook of Mineralogy\u003C\u002Fi>. Mineralogical Society of America \u003Ca target='_blank' href='https:\u002F\u002Fwww.handbookofmineralogy.org\u002Fpdfs\u002Fgeigerite.pdf' class='refpdflink'>\u003C\u002Fa>",[],[195],{"id":196,"url":197,"label":198,"formula":199,"spacegroup":200,"year":28},5474,"\u002Fcif\u002F5474.cif","Graeser 1989","As4 Mn5 O26 H22","P -1",[202,203],"Geigeriet","IMA1985-028",[205,209,214,218,222,225,228],{"lang":206,"names":207},"ca",[208],"geigerita",{"lang":210,"names":211},"de",[212,213],"Geigerit","IMA 1985-028",{"lang":215,"names":216},"eu",[217],"Geigerita",{"lang":219,"names":220},"fr",[221],"geigerite",{"lang":223,"names":224},"it",[7],{"lang":226,"names":227},"nl",[221],{"lang":229,"names":230},"zh",[231],"水砷锰矿","Q3759225",{"history":11,"applications":11}]