is a carbonate mineral
, usually found as a secondary mineral in copper
deposits. Its chemical formula is (Zn,Cu)5
. The zinc to copper ratio is about 5:4×←×←±.
Associated minerals include: rosasite, smithsonite, hemimorphite, hydrozincite, malachite and azurite.
It was first described in 1839 by Bottger who named the mineral for its zinc and copper content after the Greek όρειχαλκος, for "mountain brass" or "mountain copper", the name of a fabulous metal.