0CACOXENITE (Hydrated Iron Aluminum Phosphate Oxide Hydroxide)
0CALAVERITE (Gold Telluride)
0CALCIOVOLBORTHITE (Calcium Copper Vanadate Hydroxide)
5CALCITE (Calcium Carbonate)
0CALEDONITE (Copper Lead Carbonate Sulfate Hydroxide)
0CALOMEL (Mercury Chloride)
0CANCRINITE (Sodium Calcium Aluminum Silicate Carbonate)
0CARBOCERNAITE (Calcium Sodium Strontium Cerium Barium Carbonate)
0CARLETONITE (Hydrated Potassium Sodium Calcium Carbonate Silicate Fluoride Hydroxide)
0CARNALLITE (Hydrated Potasium Magnesium Chloride)
0CARNELIAN (variety of Quartz - Silicon Oxide)
0CARNOTITE (Hydrated Potassium Uranyl Vanadate)
0CATAPLEIITE (Hydrated Sodium Zirconium Silicate)
2CAVANSITE (Hydrated Calcium Vanadium Silicate)
0CELESTITE (Strontium Sulfate)
1CERUSSITE (Lead Carbonate)
0CHABAZITE (Hydrated Calcium Aluminum Silicate)
0CHALCANTHITE (Hydrated Copper Sulfate)
0CHALCEDONY (variety of Quartz - Silicon Oxide)
0CHALCOCITE (Copper Sulfide)
0CHALCOPHYLLITE (Hydrated Copper Aluminum Sulphate Arsenate Hydroxide)
0CHALCOPYRITE (Copper Iron Sulfide)
0CHALCOSIDERITE (Hydrated Copper Iron Phosphate Hydroxide)
0CHALCOTRICHITE (variety of Cuprite, Copper Oxide)
0CHALK (a sedimentary rock)
0CHAROITE (Hydrated Sodium Calcium Barium Strontium Silicate Hydroxide Fluoride)
0CHENGDEITE (Iridium Iron)
0CHILDRENITE (Hydrated Iron Manganese Aluminum Phosphate Hydroxide)
0CHKALOVITE (Sodium Beryllium Silicate)
0CHLORAPATITE (the chlorine rich apatite)
0CHLORARGYRITE (Silver Chloride)
0CHLORITE (Iron Magnesium Aluminum Silicate Hydroxide)
0CHONDRODITE (Magnesium Iron Silicate Fluoride Hydroxide)
0CHROMITE (Magnesium Iron Chromium Oxide)
0CHRYSOBERYL (Berylium Aluminum Oxide)
1CHRYSOCOLLA (Hydrated Copper Silicate)
0CHRYSOPRASE (variety of Quartz - Silicon Oxide)
0CHRYSOTILE (variety of Serpentine, Magnesium Iron Silicate Hydroxide)
0CHURCHITE (Hydrated Yttrium Erbium Phosphate)
0CINNABAR (Mercury Sulfide)
0CITRINE (variety of Quartz- Silicon Oxide)
0CLAUSTHALITE (Lead Selenide)
*CLAYS (Group)
0CLEAVELANDITE (variety of Albite, Sodium Aluminum Silicate)
0CLIFFORDITE (Uranium Tellurate)
0CLINOCHLORE (Magnesium Aluminum Silicate Hydroxide)
0CLINOCLASE (Copper Arsenate Hydroxide)
0CLINOHEDRITE (Hydrated Calcium Zinc Silicate)
0CLINOHUMITE (Magnesium Iron Silicate Fluoride Hydroxide)
0CLINOPTILOLITE (Hydrated Sodium Potassium Calcium Aluminum Silicate)
0COAL (an organic sedimentary rock)
0COBALTITE (Cobalt Arsenic Sulfide)
0COBALTOCALCITE (alternate name for Sphaerocobaltite)
0COCONINOITE (Hydrated Iron Aluminum Uranyl Phosphate Sulfate Hydroxide)
0COESITE (Silicon Dioxide)
0COLEMANITE (Hydrated Calcium Borate Hydroxide)
0COLLINSITE (Hydrated Calcium Magnesium Iron Phosphate)
0COLUMBITE (Iron Magnesium Manganese Niobium Tantalum Oxide)
0COMETS (primordial icy rocks in space)
0CONICHALCITE (Calcium Copper Arsenate Hydroxide)
0CONNELLITE (Hydrated Copper Sulfate Chloride Hydroxide)
0COPIAPITE (Hydrated Iron Magnesium Sulfate Hydroxide)
0CORDIERITE (Magnesium Aluminum Silicate)
0CORDYLITE (Barium Cerium Lanthanum Carbonate Fluoride)
0CORNETITE (Copper Phosphate Hydroxide)
0CORNWALLITE (Copper Arsenate Hydroxide)
0CORUNDUM (Aluminum Oxide)
0COVELLITE (Copper Sulfide)
0CREEDITE (Hydrated Calcium Aluminum Sulfate Fluoride Hydroxide)
0CRISTOBALITE (Silicon Dioxide)
0CROCOITE (Lead Chromate)
0CROCIDOLITE (asbestiform variety of Riebeckite, Sodium Iron Magnesium Silicate Hydroxide)
0CRYOLITE (Sodium Aluminum Fluoride)
0CUBANITE (Copper Iron Sulfide)
0CUMENGITE (Lead Copper Chloride Hydroxide)
0CUMMINGTONITE (Magnesium Iron Silicate Hydroxide)
1CUPRITE (Copper Oxide)
0CUPROADAMITE (Copper Zinc Arsenate Hydroxide)
0CUPROSKLODOWSKITE (Hydrated Copper Uranyl Silicate)
0CYANOTRICHITE (Hydrated Copper Aluminum Sulfate Hydroxide)
0CYLINDRITE (Iron Lead Tin Antimony Sulfide)