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Tablets are flattened on {110}, elongated and striated parallel to [001], and exhibit the forms {110}, {1_10}, and {001}",2.5,"2.88","2.896","Vitreous","Transparent","white","colorless",[49,48],[48],"none in long or short wave UV","{110} very good, {011} and \u003Cmi>{1_10}\u003C\u002Fmi>","Very Good","Step-Like","brittle","Biaxial","+","1.692","1.693","1.718","22.9","22",1,1.692,1.718,"r\u003Cv","Non-pleochroic","At room temperature, the mineral is insoluble in H2O, but it is immediately soluble in dilute HCl.","Fuchs quarry exploits hydrothermal Mn-Fe-As-rich veins in a rhyolite body. A late-stage, low-temperature supergene mineral in an arsenic-rich vein.","Type material is deposited in the collections of the Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, CA 90007, USA, catalogue number 77379","New structure type","After type locality. Hartkoppe is the mountain on which the Fuchs quarry is located.","2026-04-09 17:54:20",[],[],[],[],[80],{"id":81,"txt":82,"latitude":83,"longitude":84,"country":85},4634,"Fuchs Quarry, Hartkoppe, Sailauf, Aschaffenburg District, Lower Franconia, Bavaria, Germany",50.0336111,9.2730556,"Germany",[87,92],{"id":88,"year":89,"html":90,"doi":91},19256681,2025,"Bosi, Ferdinando; Hatert, Frédéric; Pasero, Marco; Mills, Stuart J. (2025) IMA Commission on New Minerals, Nomenclature and Classification (CNMNC) – Newsletter 88. \u003Ci>Mineralogical Magazine\u003C\u002Fi>,  89. 1-11 \u003Ca target='_blank' href='https:\u002F\u002Fdoi.org\u002F10.1180\u002Fmgm.2025.10183'>doi:10.1180\u002Fmgm.2025.10183\u003C\u002Fa>","10.1180\u002Fmgm.2025.10183",{"id":93,"year":94,"html":95,"doi":96},19821917,2026,"Kampf, Anthony R.; Möhn, Gerhard; Ma, Chi; Désor, Joy (2026) Hartkoppeite, a new mineral with a novel polyoxometalate sandwich cluster. \u003Ci>American Mineralogist\u003C\u002Fi>.  \u003Ca target='_blank' href='https:\u002F\u002Fdoi.org\u002F10.2138\u002Fam-2026-10210'>doi:10.2138\u002Fam-2026-10210\u003C\u002Fa>","10.2138\u002Fam-2026-10210",[],[],[100,101],"Hartkoppeiet","IMA2025-056",[103,107],{"lang":104,"names":105},"ca",[106],"hartkoppeïta",{"lang":108,"names":109},"de",[110,111],"Hartkoppeit","IMA 2025-056","Q137553333",{"history":6,"applications":6}]