Cuprite occurs in most cupriferous mines, but never by itself in large quantities.
Deposits of such cupriferous pyrites are widely distributed and are often of great magnitude.
It occurs in cupriferous mine waters and as the minerals chalcanthite or cyanosite, CuSO 4.5H 2 O, and boothite, CuSO 4.7H 2 O.
The largest producer is Spain, with upwards of 350,000 tons, including the cupriferous pyrites.
Slightly cupriferous silver is made into dry nitrate and the latter fused to.
Copper silicates occur in the mineral kingdom, many minerals owing their colour to the presence of a cupriferous element.