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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 (Zaïre). 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 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
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
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