Corundum: Properties and Occurrences
Corundum is a crystalline form of aluminum oxide (Al2O3) typically containing traces of iron, titanium, vanadium, and chromium. It is the third hardest natural mineral…
Geographic Minerals
Cornwallite: Properties and Occurrences
Cornwallite is an uncommon copper arsenate mineral with formula Cu5(AsO4)2(OH)4. It is a mineral consisting of a basic copper arsenate resembling malachite. It was first…
Cornubite
Cornubite is a rare secondary copper arsenate mineral with formula: Cu5(AsO4)2(OH)4. It is a mineral containing arsenic, copper, hydrogen, and oxygen. These crystals are very…
Corkite: Properties and Occurrences
Corkite is a phosphate mineral in the beudantite subgroup of the alunite group. It is a phosphate-sulfate-hydroxide of lead and iron [formula- PbFe[(OH)6:SO4:PO4] that is…
Cordierite: Properties and Occurrences
Cordierite (mineralogy) or iolite (gemology) is a magnesium iron aluminum cyclosilicate. It is not a well known or popular mineral for mineral collectors. However, its…
Corderoite: Properties and Occurrences
Corderoite is an extremely rare mercury sulfide chloride mineral with formula Hg3S2Cl2. It is an isometric-tetartoidal mineral containing chlorine, mercury, and sulfur. Corderoite occurs as…
Native Copper
Native copper is an uncombined form of copper that occurs as a natural mineral. It has high electrical and thermal conductivity and also very malleable. Copper…
Copiapite: Properties and Occurrences
Copiapite is a hydrated iron sulfate mineral with formula: Fe2+Fe43+(SO4)6(OH)2.20H2O. It is a secondary mineral that forms from the oxidation of iron sulfide deposits. It…
Cooperite: Properties and Occurrences
Cooperite is a grey mineral consisting of platinum sulfide (PtS), generally in combinations with sulfides of other elements such as palladium and nickel (PdS and…
Connellite: Properties and Occurrences
Connellite is a rare mineral species, a hydrous copper chloro-sulfate, Cu19(OH)32(SO4)Cl4·3H2O, crystallizing in the hexagonal system. It is a rare hexagonal hydrous copper chlorosulfate mineral.…
Conichalcite
Conichalcite, CaCu(AsO4)(OH), is a relatively common arsenate mineral related to duftite (PbCu(AsO4)(OH)). It is an orthorhombic-disphenoidal mineral containing arsenic, calcium, copper, hydrogen, and oxygen. It…
Combeite
Combeite is a rare silicate mineral with the formula Na2Ca2Si3O9. It is a trigonal-trapezohedral colorless mineral containing calcium, oxygen, silicon, and sodium. It has a…
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