What is "aurichalcite"

Aurichalcite \Au`ri*chal"cite\, n. [See Aurichalceous.] (Min.) A hydrous carbonate of copper and zinc, found in pale green or blue crystalline aggregations. It yields a kind of brass on reduction.

n. (context mineral English) A basic carbonate mineral of copper and zinc.

Aurichalcite is a carbonate mineral, usually found as a secondary mineral in copper and zinc deposits. Its chemical formula is (Zn,Cu)(CO)(OH). The zinc to copper ratio is about 5:4.