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Cinnabar: HgS Edoylerite: Hg++3Cr++++++O4S2
Comments: Yellow prismatic crystals of edoylerite with red cinnabar. Location: Clear Creek Claim (Clear Creek Mine), New Idria district, San Benito Co., California, USA. Scale: Picture size 1 mm. © Thomas Witzke / Abraxas-Verlag
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
Clarkeite: (Na,Ca,Pb)(UO2)O(OH)·0-1(H2O)
Comments: Massive orange clarkeite. Location: Bjertnes,Krøderen, 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
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
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
Clinochrysotile: Mg3Si2O5(OH)4
Comments: Asbestiform crystals of brown Clinochrysotile. Location: Callenberg North (no. 2) open cut, Callenberg, Glauchau, Saxony, Germany. Scale: Picture size 6 mm. © Thomas Witzke / Abraxas-Verlag
Clinomimetite: Pb5(AsO4)3Cl
Comments: Yellow crystals of clinomimetite. Location: Johanngeorgenstadt, Erzgebirge, Saxony, Germany. Scale: Size of the largest crystal 12 mm. © Thomas Witzke / Abraxas-Verlag
Cobaltarthurite: CoFe+++2(AsO4)2(OH)2·4(H2O) Arseniosiderite: Ca2Fe+++3(AsO4)3O2·3(H2O)
Comments: Olive-greenish crystalline druse of cobaltarthurite with spherical arseniosiderite. Location: Pastrana, Mazarrón, Murcia, Spain. Scale: Picture size 1.3 mm. © Thomas Witzke / Abraxas-Verlag
Cobaltaustinite: CaCo(AsO4)(OH)
Comments: Green, tabular crystal of cobaltaustinite. Location: Rappold Mine, Neustädtel, Schneeberg District, Erzgebirge, Saxony, Germany. Scale: Picture size 3 mm. © Thomas Witzke / Abraxas-Verlag
Cobaltkoritnigite: (Co,Zn)(AsO3OH)·(H2O) Erythrite: Co3(AsO4)2·8(H2O)
Comments: Dark purplish cobaltkoritnigite with pink erythrite. Location: Schneeberg District, Erzgebirge, Saxony, Germany. Scale: Picture size 5 mm. © Thomas Witzke / Abraxas-Verlag
Cobaltlotharmeyerite: Ca(Co,Fe,Ni)2(AsO4)2(OH,H2O)2
Comments: Brown crystalline aggregates of cobaltlotharmeyerite on matrix. Location: Sauschwart Mine, Neustädtel, Schneeberg District, Erzgebirge, Saxony, Germany. Scale: Picture size 5 mm.. © Thomas Witzke / Abraxas-Verlag
Cobalttsumcorite: Pb(Co,Fe)2(AsO4)2(OH,H2O)2
Comments: Brown crystals of cobalttsumcorite. Location: Rappold Mine, Neustädtel, Schneeberg District, Erzgebirge, Saxony, Germany. Scale: Picture size 4 mm. © Thomas Witzke / Abraxas-Verlag
Coccinite: Hg++I2 (?) Sulfur: S8
Comments: Orange-red coccinite on sulfur. Due to the volatility of the mineral at room temperature, the sample is preserved in a closed vial. The photo was made through the vial, therefore the sharpness is reduced. Location: Lichtenberg Mine, Ronneburg U Deposit, Gera district, Thuringia, Germany. Scale: Picture size 1 mm. © Thomas Witzke / Abraxas-Verlag
Cohenite: (Fe,Ni,Co)3C
Comments: Bluish gray, metallic iridescent crystals of cohenite on matrix. Location: Kopeisk, Chelyabinsk Oblast', Urals Region, Russia. Scale: 2.3 mm. © Thomas Witzke / Abraxas-Verlag
Colquiriite: CaLiAlF6
Comments: Colorless tabular crystals of colquiriite on matrix. Location: Serra Branca pegmatite, Pedra Lavrada, Picuí, Paraíba, Northeast Region, Brazil. Scale: Picture size 0.8 mm. © Thomas Witzke / Abraxas-Verlag
Columbite-(Fe): Fe++Nb2O6
Comments: Dark grains of columbite-(Fe) wtth small brown grains of fluorcarbonates of LREE. Corrected identificaton by Pavel M. Kartashov who analyzed this occurrence of 'chagbaiite'. Location: Round Top Rhyolite, Hudspeth County, Texas, USA. Scale: Picture Size 1 mm. © Thomas Witzke
Columbite-(Mn): (Mn,Fe++)(Nb,Ta)2O6
Comments: Small brown tabular crystals of manganocolumbite in a pegmatite. Location: Neuland Quarry, Döbschütz, Königshain, Oberlausitz, Saxony, Germany. Scale: Picture size 4 mm. © Thomas Witzke / Abraxas-Verlag