Conichalcite, CaCu(AsO4)(OH), is a relatively common arsenate mineral related to duftite (PbCu(AsO4)(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. == Formation == Conichalcite forms in the oxidation zone...
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http://en.wikipedia.org/wiki/Conichalcite
Conichalcite is a mineral of the adelite group, often brilliant green in colour, it is a secondary mineral that forms in the oxidation zones of copper ore bodies. It is often found as an encrustation on rocks composed mainly of limonite, where it is associated with adamite, azurite, bayldonite, linarite, malachite, olivenite and smithsonite. Conich...
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http://www.probertencyclopaedia.com/browse/HC.HTM
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