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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
Cuprorivaite: CaCuSi4O10
Comments: Pale blue grains of cuprorivaite. Location: Vesuvius, Campania, Italy. Scale: See Photo. © 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
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
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
Cyanotrichite: Cu4Al2(SO4)(OH)12·2(H2O)
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
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
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