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Cummingtonite: [ ]Mg7Si8O22(OH)2
Comments: Light brown prismatic crystalline aggregate of cummingtonite with radiating structure. Location: West Chesterfield, Hampshire County, Massachusetts, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Cuprite: Cu2O
Comments: Dark red ball or sphere of cuprite crystals set on a pearly white dolomite crystal matrix. Location: Tsumeb mine, Tsumeb, Namibia. Scale: 5 x 2.5 x 4 cm. © Dan Weinrich
Cuprite: Cu2O Chrysocolla: (Cu,Al)2H2Si2O5(OH)4·n(H2O)
Comments: Semi-metallic, dark reddish gray, cuprite crystals on blue chrysocolla. Location: Mashamba West mine, Shaba, Congo. Scale: 7.5 x 4.7 x 2.3 cm. © Fabre Minerals
Comments: Red, acicular chalcotrichite crystals as a fine, fibrous red mass on matrix. Location: Christmas mine, Gila Co., Arizona, USA. Scale: Picture size 5 mm. © Tom Loomis / Dakota Matrix
Cuprobismutite: Cu10Bi12S23 Kupcikite: Cu3.4Fe0.6Bi5S10
Comments: Backscattered electron image of kupcíkite (ku) replacing cuprobismutite (cu); both phases are in turn replaced by bsimuthinite derivative (bd79-92). Location: Felbertal, Austria. Scale: Scale bar 100 µ-m. © Canadian Mineralogist
Cuprocopiapite: CuFe+++4(SO4)6(OH)2·20(H2O)
Comments: Grayish green crusts of cuprocopiapite on gypsum. Location: Copper Queen Mine, Double Mountain Fork of Brazois River, Stonewall County, Texas, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Cuproiridsite: CuIr2S4 Isoferroplatinum: (Pt,Pd)3(Fe,Cu)
Comments: Gray equant crystal of cuproiridsite in light gray isoferroplatinum. Polished section (from microprobe analysis) in reflected light. Location: Konder Mine, Konder alkaline-ultrabasic massif, Aldan shield, Saha (Sakha) Republic (Yakutia), Eastern-Siberian Region, Russia. Scale: Picture size 0.14 mm. © Thomas Witzke / Abraxas-Verlag
Cupromakovickyite: Cu4AgPb2Bi9S18 Hodrushite: Cu8Bi12S22
Comments: Kup?cíkite (ku) and hodrushite (ho) partly replaced by bismuthinite derivative (bd56) with relict lamellae of low-Cu (4P) and cupromakovickyite [4P(Cu,Pb)]. (CanMin, 41:1165). Location: Scheelite deposit of Felbertal, Austria. Scale: Scale Bar 100 µm. © Canadian Mineralogist
Cupromakovickyite: Cu4AgPb2Bi9S18 Makovickyite: Ag1.5Bi5.5S9
Comments: SEM polished section detail of a grain of cupromakovickyite (dark gray) with locally exsolved lamellae (bright gray) of makovickyite. (CanMin, 46:503). Location: Baita Bihor, Romania.. Scale: See Image. © Canadian Mineralogist
Cupropavonite: AgPbCu2Bi5S10
Comments: BSE image of pavonite matrix (light gray) showing thin exsolution lamellea of cupropavonite (darker gray, C). (Axis, Volume 2, Number 4 (2006)). Location: Lucky Lucy mine, Darwin mining district, Inyo County, California, USA. Scale: Gail E. Dunning / Mineralogical Record. © Mineralogical Record
Cupropearceite: [Cu6As2S7][Ag9CuS4]
Comments: Crystal of cupropearceite. Location: Sarbay Mine, near city of Rudnyi, Kostanai Oblast', Kazakhstan. Scale: Crystal size 1 mm. © Tom Loomis / Dakota Matrix
Cuprorhodsite: CuRh2S4
Comments: Grain UK296A-1, erlichmanite (1), Ru-rich erlichmanite (2), cuproiridsite (3), and cuprorhodsite (4). (CanMin, v40:1127). Location: Uktus chromitites complexes in the northern and central Urals, Russia. Scale: See Image. © Canadian Mineralogist
Cuprorivaite: CaCuSi4O10
Comments: Pale blue grains of cuprorivaite. Location: Vesuvius, Campania, Italy. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Cuprosklodowskite: Cu[(UO2)(SiO2OH)]2·6(H2O)
Comments: Very-fine, acicular crystals of apple green cuprosklodowskite on matrix. Location: Musonoi Mine, Katanga, Democratic Republic of the Congo. Scale: Not Given. © John Veevaert
Comments: Green, acicular cuprosklodowskite crystals. Location: Mashamba West Mine, Kolwezi, Shaba (Katanga), Congo (Zaďre). Scale: Picture size 3 mm. © Paul M. Schumacher
Cuprospinel: (Cu,Mg)Fe+++2O4
Comments: 2mm piece of from the type specimen matrix with disseminated, black cuprospinel. Location: Consolidated Rambler mine, Baie Verte, Newfoundland, Canada. Scale: Specimen size 2 mm. © Tom Loomis / Dakota Matrix
Cuprostibite: Cu2(Sb,Tl) Ussingite: Na2AlSi3O8(OH)
Comments: Massive ussingite hosting grains of the very rare copper antimony-thallium bearing cuprostibite. Location: Ilimaussaq, Tasseq, Greenland. Scale: 4.8 x3.4 cm. © John Veevaert
Cuprotungstite: Cu++3(WO4)2(OH)2
Comments: Tan coatings of cuprotungstite on quartz. Location: Lida, Esmeralda County, Nevada, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Cuprotungstite: Cu++3(WO4)2(OH)2 Jixianite: Pb(W,Fe+++)2(O,OH)7
Comments: Reddish brown crystal druse of jixianite with minor tan cuprotungstite. Location: Apache Mine, Hidalgo County, New Mexico, USA. Scale: See Image. © Jeff Weissman / Photographic Guide to Mineral Species
Curetonite: Ba4Al3Ti(PO4)4(O,OH)6
Comments: Translucent tabular crystal of curetonite in crystalline barite. Location: Near Golconda, Humboldt County, Nevada, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species