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| Chromatite | Chrombiotite | Chrombismite |
| Chromceladonite | Chromdisthene | Chromdravite |
| Chrome mica | Chrome-acmite | Chromejadeite |
| Chromephlogopite | Chrome-tremolite | Chromferide |
| Chromglimmer | Chrominium | Chromium |
| Chromochre | Chromphyllite | Chromsteigerite |
| Chrysocolla | Chrysophane | Chudobaite |
| Chukhrovite | Chukhrovite-(Y) | Churchite |
| Churchite-(Y) | Chursinite | Chvaleticeite |
| Chvilevaite | Cianciulliite | Ciprianiite |
| Coalingite | Cobalt pentlandite | Cobaltarthurite |
| Cobaltaustinite | Cobalt-frohbergite | Cobaltkieserite |
| Cobaltkoritnigite | Cobaltlotharmeyerite | Cobaltneust¨adtelite |
| Cobaltocalcite (of Frondel) | Cobaltomelane | Cobalttsumcorite |
| Cobalt-zippeite | Coccolite | Cochromite |
| Cocinerite | Coconinoite | Coesite |
| Colomite | Colquiriite | Columbomicrolite |
| Comancheite | Comblainite | Common mica |
| Compreignacite | Comptonite | Congolite |
| Coombsite | Coparsite | Coquandite |
| Corderoite | Cordylite | Corkite |
| Cornubite | Corundellite | Coskrenite |
| Cossaite | Cossyrite | Costibite |
| Coulsonite | Coutinhite | Coutinhoite |
| Coutinite | Cowlesite | Coyoteite |
| Craigite | Crawfordite | Creaseyite |
| Crerarite | Crichtonite | Criddleite |
| Crocalite | Crocidolite | Cronusite |
| Crossite | Cryophyllite | Cryptomelane |
| Cryptonickelmelane | Csiklovaite | Cualstibite |
| Cubic zeolite | Cubicite | Cubizit |
| Cuboargyrite | Cuboite | Cuboizite |
| Cummingtonite | Cupalite | Cuproartinite |
| Cuprocassiterite |
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