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Cerite-(Ce): Ce+++9Fe+++(SiO4)6[(SiO3)(OH)](OH)3
Comments: Brownish pink, thin, massive crystalline coating of cerite-(Ce). Location: Bastnas, Riddarhyttan, Sweden. Scale: See Image. © Rruff Database
Cernyite: Cu2CdSnS4
Comments: Gray massive, metallic cernyite. Location: Hugo Mine, Keystone, Keystone District, Pennington County, South Dakota, USA. Scale: See Image. © Rruff Database
Cesplumtantite: (Cs,Na,Ca)2(Pb,Sb+++,Sn)3Ta8O24
Comments: Brownish yellow cesplumtantite aggregate grains. Location: Manono, Shaba, Congo. Scale: See Image. © Rruff Database
Chabourneite: (Tl,Pb)21(Sb,As)91S147 Smithite: AgAsS2
Comments: Black metallic chabourneite with conchoidal fracture, associated with yellow-red realgar and deep-red smithite. Location: Jas Roux, Pelvoux Mt., Valgaudemar, Hautes-Alpes, Provence-Alpes-Côte d'Azur, France. Scale: See Image. © Rruff Database
Chistyakovaite: Al(UO2)2(AsO4)2(F,OH)·6.5H2O
Comments: Platy fragment of a pale yellow crystal of chistyakovaite sealed in plastic bag, co-type material. Location: Bota-Burum U deposit, Kazakhstan. Scale: See Image. © Rruff Database
Clinobarylite: BaBe2Si2O7
Comments: Radiating group of colorless flattened bladed clinobarylite crystals. Location: Hackmann Valley, Yukspor Mountain, Khibiny, Kola, Russia. Scale: See Image. © Rruff Database
Clinoptilolite-Ca: (Ca,Na,K)2-3Al3(Al,Si)2Si13O36·12(H2O)
Comments: Druse of colorless, clear tabular somewhat pseudohexagonal crystals of clinoptiloite-Ca in vug. Location: Fish Creek Quarry, Clackamas River, Estacada, Clackamas County, Oregon, USA. Scale: See Image. © Rruff Database
Danalite: Fe++4Be3(SiO4)3S
Comments: Orange irregular gemmy danalite in matrix. Location: Iron Mountain, Winston, New Mexico, USA. Scale: See Image. © Rruff Database
Deerite: (Fe++,Mn)6(Fe+++,Al)3Si6O20(OH)5
Comments: Black bladed deerite crystals embedded in quartz and fibrous riebeckite. Location: Laytonville quarry, Laytonville, Mendocino County, California, USA. Scale: See Image. © Rruff Database
Durangite: NaAl(AsO4)F
Comments: Equant red crystals of durangite with a dusting of white powder. Location: Northern end Thomas Range, Juab County, Utah, USA. Scale: See Image. © Rruff Database