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…
Geographic Minerals
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…
Columbite: Properties and Occurrences
Columbite, also called niobite, niobite-tantalite and columbate [(Fe, Mn)Nb2O6], is a black mineral group that is an ore of niobium. It is a black mineral,…
Coloradoite
Coloradoite, also known as mercury telluride (HgTe), is a rare telluride ore associated with metallic deposit (especially gold and silver). It is a mineral, mercury…
Collinsite: Properties and Occurrences
Collinsite is a mineral with formula Ca2(Mg, Fe2+)(PO4)2·2H2O. It a mineral consisting of a hydrous phosphate of calcium, magnesium, and iron, occurring in concentric layers…
Colimaite: Properties and Occurrences
Colimaite, the naturally occurring analog of synthetic K3VS4, is a sulfide mineral discovered in southwestern Mexico. The potassium-vanadium sulfide was collected from the crater of…
Colemanite
Colemanite [(Ca2B6O11·5H2O) or (CaB3O4(OH)3·H2O)] is a borate mineral found in evaporite deposits of alkaline lacustrine environments. It is a white crystalline mineral, typically occurring as glassy…
Cohenite: Properties and Occurrences
Cohenite is a naturally occurring iron carbide mineral with the chemical structure (Fe, Ni, Co)3 C. It is a tin-white crystalline mineral consisting of a…
Coffinite: Properties and Occurrences
Coffinite is a uranium-bearing silicate mineral with formula: U(SiO4)1-x(OH)4x. It is a uranium-bearing silicate mineral. It was first described in 1954 for an occurrence at…
Coesite: Properties and Occurrences
Coesite is a form (polymorph) of silicon dioxide SiO2 that is formed when very high pressure (2–3 gigapascals), and moderately high temperature (700°C, 1,300°F), are…
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