What is "enargite"

Enargite \En*ar"gite\, n. (Min.) An iron-black mineral of metallic luster, occurring in small orthorhombic crystals, also massive. It contains sulphur, arsenic, copper, and often silver.

n. (context mineral English) A steel gray, blackish gray, to violet black copper arsenic sulfosalt mineral with a metallic luster.

Enargite is a copper arsenic sulfosalt mineral with formula: CuAsS. It takes its name from the Greek word enarge, "distinct." Enargite is a steel gray, blackish gray, to violet black mineral with metallic luster. It forms slender orthorhombic prisms as well as massive aggregates. It has a hardness of 3 and a specific gravity of 4.45.

Enargite is dimorph of the tetragonal luzonite.