Cacoxenite, Calaverite, Calcite, Canavesite, Carletonite, Carminite, Carnallite, Carnelian, Cassiterite, Cattierite, Cavansite, Celestine, Celsian, Cerussite, Cervantite, Cesbronite, Chalcedony, Chalcopyrite, Chambersite, Chamosite, Chapmanite, Chlorite, Chondrodite, Chromite, Chrysocolla, Cinnabar, Citrine, Clausthalite, Clinochlore, Clinozoisite, Clintonite, Cobaltkoritnigite, Coesite, Coffinite, Colemanite, Columbite, Copper, Cordierite, Cornubite, Covellite, Creedite, Crocoite, Cubanite, Cummingtonite, Cuprite, Cuprosklodowskite, Cyanotrichite
