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Chalcoalumite: CuAl4(SO4)(OH)12·3(H2O)
Comments: Pale bluish stellate twins of chalcoalumite on matrix. Location: Lavender Pit, Bisbee, Cohchise County, Arizona, USA. Scale: Size Not Given. © Lou Perloff / Photo Atlas of Minerals
Chalcosiderite: CuFe+++6(PO4)4(OH)8·4(H2O)
Comments: Pale bluish transparent crystal of chalcosiderite on matrix. Location: Cornwall, England. Scale: Size Not Given. © Lou Perloff / Photo Atlas of Minerals
Chambersite: Mn3B7O13Cl
Comments: Tetragonal crystals of chambersite extracted from salt dome deposits. Location: Barkers Hill, Mont Belvieu, Chambers County, Texas, USA. Scale: Size Not Given. © Lou Perloff / Photo Atlas of Minerals
Chervetite: Pb2V2O7 Francevillite: (Ba,Pb)(UO2)2V2O8·5(H2O)
Comments: Bottle brown tabular crystals of chervetite on yellow francevilleite. Location: Mounana, Haut-Ogoue, Gabon. Scale: Size Not Given. © Lou Perloff / Photo Atlas of Minerals
Chlorargyrite: AgCl
Comments: Butterscotch colored cubic crystals of chlorargyrite on malachite. Location: Bisbee, Cochise County, Arizona, USA. Scale: Size Not Given. © Lou Perloff / Photo Atlas of Minerals
Chlorophoenicite: (Mn,Mg)3Zn2(AsO4)(OH,O)6
Comments: Clear tabular crystals of chlorophoenicite. Location: Franklin, Sussex County, New Jersey, USA. Scale: Size Not Given. © Lou Perloff / Photo Atlas of Minerals
Churchite-(Y): YPO4·2(H2O)
Comments: Acicular, radiating crystals of churchite-(Y). Location: Leoni mine, Auerbach, Bavaria, Germany. Scale: Size Not Given. © Lou Perloff / Photo Atlas of Minerals
Clinoclase: Cu3(AsO4)(OH)3
Comments: Acicular, radiating crystals of clinoclase. Location: Majuba Hill mine, Pershing County, Nevada, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Clinohedrite: CaZnSiO4·(H2O) Epidote-(Pb): (Ca,Pb,Sr)2(Al,Fe+++)3(SiO4)(Si2O7)O(OH)
Comments: Clear crystals of clinohedrite on hancockite (epidote-(Pb)). Location: Franklin, Sussex County, New Jersey, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Clinotyrolite: Ca2Cu9[(As,S)O4]4(OH)10·10(H2O) Azurite: Cu3(CO3)2(OH)2
Comments: Light blue acicular crystals of clinotyrolite on dark blue azurite. Location: Lovelock mine, Churchill County, Nevada, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Clinozoisite: Ca2Al3(SiO4)3(OH) = Ca2AlAl2(SiO4)(Si2O7)O(OH)
Comments: Light pink stellate crystal cluster of clinozoisite. Location: Sunnyside mine, Silverton District, San Juan County, Colorado, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Connellite: Cu19Cl4(SO4)(OH)32·3(H2O)
Comments: Blue acicular crystals of connellite. Location: Deep Creek Mountains, Tooele County, Utah, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
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