What is "domeykite"

Domeykite \Do"mey*kite\, n. [Named after Domeyko, a mineralogist of Chili.] (Min.) A massive mineral of tin-white or steel-gray color, an arsenide of copper.

n. (context mineral English) An isometric copper arsenide mineral, Cu₃As.

Domeykite is a copper arsenide mineral, CuAs. 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 (weathers brassy) 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 (1802–1889) by Wilhelm Haidinger.