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Copiapite: Fe++Fe+++4(SO4)6(OH)2·20(H2O)
Comments: Brownish yellow tabular crystals of copiapite. Location: Saghand, near Yazd, Yadz Province, Iran. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Coquimbite: Fe+++2(SO4)3·9(H2O)
Comments: Brownish yellow tabular crystals of coquimbite. Location: Lavender Pit, Bisbee, Cochise County, Arizona, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Cornwallite: Cu5(AsO4)2(OH)4
Comments: Emerald green botryoidal crystals of cornwallite. Location: Tintic District, Juab County, Utah, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Cristobalite: SiO2
Comments: White crystals of cristobalite frozen in obsidian glass. Location: Cerro San Cristobal, Pachuca, Hidalgo, Mexico. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Cronstedtite: Fe++2Fe+++(SiFe+++)O5(OH)4
Comments: Pyramidal crystals of cronstedtite. Location: Santa Eulalia, Chihuahua, Mexico. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Cryptomelane: K(Mn++++,Mn++)8O16 Adamite: Zn2(AsO4)(OH)
Comments: Black, rounded balls of cryptomelane and purple, transparent adamite. Location: Ojuela mine, Mapimi, Druango, Mexico. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Cumengite: Cu20Pb21Cl42(OH)40·6H2O Boleite: KPb26Ag9Cu24Cl62(OH)48
Comments: Inky blue cumengite "sixling" epitaxially overgrown on boleite. Location: Amelia mine, Santa Rosalia, Baja California Sur, Mexico. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
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
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