Wiktionary
conichalcite
n. (context mineral English) An orthorhombic-disphenoidal mineral containing arsenic, calcium, copper, hydrogen, and oxygen.
Wikipedia
Conichalcite
Conichalcite, Ca Cu( As O)(O H), is a relatively common arsenate mineral related to duftite ( PbCu(AsO)(OH)). It is green, often botryoidal, and occurs in the oxidation zone of some metal deposits. It occurs with limonite, malachite, beudantite, adamite, cuproadamite, olivenite and smithsonite.