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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
Crocoite: PbCrO4 Vauquelinite: Pb2Cu(CrO4)(PO4)(OH)
Comments: Olive-greenish vauquelinite encrusting red crocoite. Location: Callenberg North (no. 1) open cut, Callenberg, Glauchau, Saxony, Germany. Scale: Picture size 6 mm. © Thomas Witzke / Abraxas-Verlag
Crocoite: PbCrO4
Comments: Prismatic crystals of red-orange crocoite. Location: Adelaide Mine, Dundas, Tasmania. Scale: Specimen size 5 cm. © Dave Barthelmy
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
Cronusite: Ca0.2(H2O)2CrS2
Comments: Light gray grain of cronusite. Polished section (from microprobe analysis) in reflected light. Location: Enstatite meteorite, Norton Co., Kansas, USA. Scale: Picture size 0.18 mm. © Thomas Witzke / Abraxas-Verlag
Crookesite: Cu7(Tl,Ag)Se4 Eucairite: CuAgSe
Comments: Polished section (PPL) showing zoned crystal of cream-colored eucairite and pale lavender crookesite along with steel blue umangite and white clausthalite in dark gray gangue.. Location: Mine dump (tailings) of Shaft 371 near Hartenstein/Saxony, Germany. Scale: Picture size 5 mm. © Thomas Schlothauer
Crossite: Na2(Mg,Fe++)3(Al,Fe+++)2Si8O22(OH)2
Comments: Long metallic, black, prismatic crystals or crossite on matrix. Location: Webbing, Lammertal, Salzburg, Austria. Scale: Picture size 2.5 mm. © Tom Loomis / Dakota Matrix
Comments: Black prismatic crystal clusters of crossite. Location: near Valley Ford, Sonoma County, California, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Cryolite: Na3AlF6
Comments: Massive cryolite with one section of lustrous crystal faces. Location: Ivigtut, Greenland. Scale: Picture size 4 cm. © John Veevaert
Comments: Red-brown crystalline massive cryolite. Location: Katugin River, Siberia, Russia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Cryolite: Na3AlF6 Weberite: Na2MgAlF7
Comments: Gray weberite masses in white cryolite. Location: Ivigtut, Greenland. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species