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Cebollite: Ca5Al2(SiO4)3(OH)4
Comments: Green to white fibrous coating of cebollite on granular iron stained quartz. Location: Cebola Creek, Gunnison County, Colorado, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Cejkaite: Na4(UO2)(CO3)3
Comments: Yellow chalky cejkaite masses on matrix. Location: Svornost Mine, Jáchymov, Ostrov, Krusne Hory Mts (Erzgebirge), Bohemia, Czech Republic. Scale: Picture Size 0.5 cm. © Jeff Weissman / Photographic Guide to Mineral Species
Celadonite: K(Mg,Fe++)(Fe+++,Al)[Si4O10](OH)2
Comments: Greenish masses of celadonite filling vesicles in basaltic rock. Location: Socorro County, New Mexico, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Celsian: BaAl2Si2O8 Hendricksite: K(Zn,Mg,Mn)3Si3AlO10(OH)2
Comments: Gray massive celsian with dark red hendricksite. Location: Franklin, Sussex County, New Jersey, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Cerotungstite-(Ce): (Ce,REE)W2O6(OH)3 Anthoinite: AlWO3(OH)3 Ferberite: Fe++WO4
Comments: Yellow cerotungstite-(Ce), with black ferberite veins and whitish anthoinite. Location: Bugarama, Rwanda. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Cesarolite: PbH2Mn++++3O8
Comments: Black to dark brown botryoidal masses of cesarolite in white calcite. Location: Sidi-amor-ben-Salem, Tunisia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Cesbronite: Cu5(TeO3)2(OH)6·2(H2O)
Comments: Minute green spherical cesbronite on calcite. Location: Mina La Oriental, Moctezuma, Sonora, Mexico. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Chabazite-K: (K2,Ca,Na2,Mg)[Al2Si4O12]·6(H2O)
Comments: Minute colorless crystals of chabazite-K on matrix. Location: Tyul'bnyunuai River Valley, Lovozero Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia. Scale: Picture Size 0.6 mm. © Jeff Weissman / Photographic Guide to Mineral Species
Chaidamuite: (Zn,Fe++)Fe+++(SO4)2(OH)·4(H2O)
Comments: Pale yellow earthy coatings of chaidamuite with brown limonite on friable matrix. Location: Getchell Mine, Humboldt County, Nevada, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Chalcanthite: CuSO4·5(H2O)
Comments: Fibrous columnar crystalline chalcanthite. Location: Planet Mine, La Paz County, Arizona, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Chalcocite: Cu2S Eskolaite: Cr2O3
Comments: Green crystalline eskolaite on massive chalcocite. Location: Lubelin, Poland. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Chalconatronite: Na2Cu(CO3)2·3(H2O)
Comments: Crystalline crusts of blue chalconatronite on sandstone. Location: Slick Rock, Egnar Area, San Miguel County, Colorado, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Challacolloite: KPb2Cl5
Comments: White to transparent challacolloite crystals on matrix. Location: Eruption of 1855, Mount Vesuvius, Campania, Italy. Scale: See Image. © Jeff Weissman / Photographic Guide to Mineral Species
Chamosite: (Fe++,Mg,Fe+++)5Al(Si3Al)O10(OH,O)8
Comments: Dark green sectile massive chamosite. Location: Jalgaon, Maharashtra, India. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Chaoite: C
Comments: Dark masses of chaoite intermixed with graphite on rock shocked by meteorite impact. Location: Ries Crater, Bopfingen, Bavaria, Baden-Wurttemberg. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Charoite: K5Ca8(Si6O15)2(Si2O7)Si4O9(OH)·3(H2O) Fedorite: KNa4Ca4(Al,Si)16O36(OH,F)4·6(H2O)
Comments: Tan crystalline platy fedorite in pale violet charoite. Location: Murun, Republic of Sakha, Siberia, Russia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Charoite: K5Ca8(Si6O15)2(Si2O7)Si4O9(OH)·3(H2O) Tinaksite: K2Na(Ca,Mn++)2(Ti,Fe)O[Si7O18(OH)]
Comments: Yellow-brown prismatic tinaksite crystals in purple charoite with black aegirine. Location: Murun, Aldan Uplift, Chara and Olekma Rivers, near Olekminsk, Republic of Sakha, Siberia, Russia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Charoite: K5Ca8(Si6O15)2(Si2O7)Si4O9(OH)·3(H2O) Tokkoite: K2Ca4[Si7O18(OH)](F,OH)
Comments: Yellow crystalline tokkoite intermixed with purple charoite (viewed cross-sectional to fiber direction). Location: Murun, Aldan, Republic of Sakha, Siberia, Russia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Chayesite: K(Mg,Fe++)4Fe+++(Si12O30) Merrihueite: (K,Na)2(Fe++,Mg)5Si12O30
Comments: A sharp, chemically zoned crystal of copper-brown merrihueite(?) (see Lapis-Magazine 4/2002 Page 38/39) overgrown on bluish chayesite. Location: Basalt quarry, Pauliberg Mt., Kobersdorf, Oberpullendorf, Burgenland, Austria. Scale: Crystal Size 0.15 cm. © Jeff Weissman / Photographic Guide to Mineral Species
Chelkarite: CaMgB2O4Cl2·7(H2O) (?)
Comments: Minute transparent nearly colorless microcrystals of chelkarite. Location: Chelkar, Zapadno-Kazahstan, Kazakhstan. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species