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Ciprianiite: Ca4[(Th,U)(REE)]2(Al,[ ])2[Si4B4O22](OH,F)2
Comments: Black crystal of ciprianiite in quartz. Location: Monte Cavalluccio, Capagnano, Roma, Lazio, Italy. Scale: Picture size 2 mm. © Paul M. Schumacher
Clairite: (NH4)2Fe+++3(SO4)4(OH)3·3(H2O) Rostite: AlSO4(OH,F)·5(H2O)
Comments: Brownish crystals of clairite on white massive rostite. Location: Anna Mine, Alsdorf, Aachen, North Rhine-Westphalia, Germany. Scale: Picture size 5 mm. © Thomas Witzke / Abraxas-Verlag
Claraite: (Cu,Zn)3(CO3)(OH)4·4(H2O)
Comments: Green, round spherical grain of claraite on fluorite. Location: Clara Mine, Oberwolfach, Wolfach Valley, Black Forest, Baden-Württemberg, Germany. Scale: Picture size 1.5 mm. © Thomas Witzke / Abraxas-Verlag
Claringbullite: Cu++4(OH)7Cl
Comments: Velvety micro botryoids of claringbullite lining vug in slag. Location: Val Varenna, Pegli, Genova, Liguria, Italy. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Clarkeite: (Na,Ca,Pb)(UO2)O(OH)·0-1(H2O)
Comments: Massive orange clarkeite. Location: Bjertnes,Krřderen, Buskerud, Norway. Scale: Picture size 8 mm. © Thomas Witzke / Abraxas-Verlag
Claudetite: As2O3 Arsenic: As
Comments: Colorless prismatic crystal of claudetite on native arsenic. Location: Jáchymov (St Joachimsthal), Krusné Hory (Erzgebirge), Západoceský Kraj, Bohemia, Czech Republic. Scale: Picture size 2 mm. © Thomas Witzke / Abraxas-Verlag
Clausthalite: PbSe
Comments: black massive and botryoidal clausthalite on matrix. Location: Lasovice, Mittelbuhmen, Stredocesky, Czech Republic. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Clausthalite: PbSe Schlemaite: (Cu,[ ])6(Pb,Bi)Se4 Eucairite: CuAgSe
Comments: Reflected-light digital-image of the intermixed schlemaite grain in type sample F2, from which the reflectance, crystallographic and crystal-structure data were obtained. (CanMin, v 41, p 1435). Location: "Tiber" dike, -855-m level, block 5128, main shaft # 371, Niederschlema-Alberoda vein-type uranium depost at Hartensein, Erzgebirge, Germany. Scale: See Picture. © Canadian Mineralogist
Cleusonite: Pb(U++++,U++++++)(Ti,Fe++,Fe+++)20(O,OH)38
Comments: Black submetallic ceusonite crystals in matrix. Location: Kaisererbruch, Rauris, Salzburg, Austria. Scale: Specimen Size 3x4.5 cm. © Diederik Visser
Cliffordite: UTe3O9
Comments: Small greenish crystals of cliffordite encrusting matrix. Location: Candelaria Mine, Moctezuma, Sonora, Mexico. Scale: Picture size 5 mm. © Thomas Witzke / Abraxas-Verlag
Clinoatacamite: Cu2(OH)3Cl
Comments: Green clinoatacamite on halite and anhydrite. Location: Bernburg, Stassfurt Deposit, Saxony-Anhalt, Germany. Scale: Picture size 4 mm. © Thomas Witzke / Abraxas-Verlag
Clinobarylite: BaBe2Si2O7
Comments: Radiating group of colorless flattened bladed clinobarylite crystals. Location: Hackmann Valley, Yukspor Mountain, Khibiny, Kola, Russia. Scale: See Image. © Rruff Database
Clinobisvanite: BiVO4
Comments: Numerous yellow to yellowish-orange sub-mm crystals of clinobisvanite on matrix. Location: Linka Mine, Lander County, Nevada, USA. Scale: 2.2 x 2.5 cm. © John Veevaert
Comments: Deep yellow platy crystals of clinobisvanite to less than 0.2mm. Location: Linka mine, Lander Co., Nevada, USA. Scale: Picture size 0.5 cm. © Tom Loomis / Dakota Matrix
Clinocervantite: Sb+++Sb+++++O4
Comments: White crystals of Clinocervantite. Location: Cetine di Cotorniano mine (Cetine mine), Rosia, Siena, Tuscany, Italy. Scale: Picture size 1.5 mm. © Thomas Witzke / Abraxas-Verlag
Clinochalcomenite: CuSeO3·2(H2O)
Comments: Blue-green crystalline coating of clinochalcomenite on sulfide ore. Location: Mina El Dragon, Potosi, Bolivia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Clinochalcomenite: CuSeO3·2(H2O) Kerstenite: PbSeO4 (?) Krutaite: CuSe2
Comments: Tan opaque fibrous kerstenite with possible blue clinochalcomenite on dark krutaite. Location: Mina El Dragon, Potosi, Bolivia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Clinochlore: (Mg,Fe++)5Al(Si3Al)O10(OH)8 Andradite: Ca3Fe+++2(SiO4)3
Comments: Transparent topazolite, the yellow variety of andradite on clinochlore. Location: Yellow Cat Mine, New Idria District, San Benito County. California, USA. Scale: 2.7 x 2.5 cm. © Fabre Minerals
Clinochlore: (Mg,Fe++)5Al(Si3Al)O10(OH)8
Comments: Purple clinochlore (Kammererite) crystal cluster. Location: Kop Daglari, Turkey. Scale: 1.4 cm across. © John Veevaert
Clinochlore: (Mg,Fe++)5Al(Si3Al)O10(OH)8 Perovskite: CaTiO3
Comments: Square, opaque perovskite on green clinochlore. Very brilliant and with large crystals (2 x 1.5 cm.). Location: Ilmen Mountains. Chelyabinsk, Urals, Russia. Scale: 6 x 4.5 cm. © Fabre Minerals