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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
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
Curienite: Pb(UO2)2V2O8·5(H2O) Francevillite: (Ba,Pb)(UO2)2V2O8·5(H2O)
Comments: Intense yellow curienite and orange francevillite. Location: Mouonana, Haut-Ogoue, Gabon. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Curite: Pb3+x(H2O)2[(UO2)4+x(OH)3-x]2, x~0.5
Comments: Orangish red curite crystals. Location: Shinkolobwe mine, Tantara, Shaba, Democratic Republic of the Congo. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Cuspidine: Ca4Si2O7(F,OH)2
Comments: Tan spear-shaped micro crystals of cuspidine in diopside. Location: San Vito Quarry, Vesuvius, Napoli, Campania, Italy. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Cuspidine: Ca4Si2O7(F,OH)2 Jasmundite: Ca11(SiO4)4O2S
Comments: Tan-brownish crystals of jasmundite and dark green cuspidine with gehlenite and spinel in matrix. Location: Bellerberg, Eifel, Germany. Scale: Not Given. © Diederik Visser
Cuzticite: Fe+++2Te++++++O6·3(H2O)
Comments: Thin scaly yellow-brown crust of cuzticite on quartz. Location: Mina Bambollita, Moctezuma, Sonora, Mexico. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Cyanochroite: K2Cu(SO4)2·6(H2O)
Comments: Pale blue crystal cluster of cyanochroite. Location: Eruption of 1870, Mount Vesuvius, Napoli, Campania, Italy. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Cyanophyllite: Cu++5Al2(SbO4)3(OH)7·9(H2O)
Comments: Small pale green cyanophyllite crystals with blue azurite on matrix. Location: Monte Avanza, Forni Avoltri, Udine, Italy. Scale: Picture size 1 cm. © Diederik Visser
Cyanotrichite: Cu4Al2(SO4)(OH)12·2(H2O)
Comments: Blue, hairy crystals of cyanotrichite. Location: Grandview mine, Grand Canyon, Coconino County, Arizona, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Cyanotrichite: Cu4Al2(SO4)(OH)12·2(H2O) Azurite: Cu3(CO3)2(OH)2
Comments: Blue, hairy crystals of cyanotrichite with dark-blue, blocky azurite on a green, malachite matrix. Location: Maid of Sunshine Mine, Cochise County, Arizona, USA. Scale: See Image. © Jeff Weissman / Photographic Guide to Mineral Species
Comments: Blue, acicular sprays of cyanotrichite on a gray matrix. Location: Maid of Sunshine Mine, Cochise County, Arizona, USA. Scale: See Image. © Jeff Weissman / Photographic Guide to Mineral Species
Cylindrite: Pb3Sn4FeSb2S14
Comments: Cylindrical crystals of cylindrite in granular tin sulfide ore. Location: Montserrat Mine, Poopo, Oruro, Bolivia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Cymrite: BaAl2Si2O8·(H2O)
Comments: Pearly white cymrite with jadeite in greywacke rock. Location: Pacheco Pass, Santa Clara County, California, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species