A

David

Darling

chalcanthite

chalcanthite

Chalcanthite is a mineral that consists of mainly of hydrated copper sulfate (CuSO4), although it is rarely used as a source of copper. It occurs as greenish-blue triclinic crystals or as fibrous veins or stalactites. It is soluble in water and has a nauseating taste. Hardness 2.5; relative density 2.25.