Domeykite
Domeykite is a copper arsenide mineral, Cu3As. It crystallizes in the isometric system, although crystals are very rare. It typically forms as irregular masses or botryoidal forms. It is an opaque, white to gray metallic mineral with a Mohs hardness of 3 to 3.5 and a specific gravity of 7.2 to 8.1
It was first described in 1845 in the Algodones mines, Coquimbo, Chile. It was named after Polish mineralogist Ignacy Domeyko by Wilhelm Haidinger.Uses
Domeykite, being a minor copper ore is used for obtaining copper. It can also be polished and used for ornamental purposes.
nugget, a mixture of domeykite, algodonite and native copper
