Calcite
Calcitization
Cancrinite
Cassiterite
Celadonitization
Chabazite
Chalcedony
Chalcocite
Chalcopyrite
Chlorite
Chloritization
Chloritoid
Cinnabar
Clay minerals
Clinohumite
Copper
Covellite
Cristobalite
Cummingtonite
Cuprite
Cymatolite
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