On exposure to air, chalcopyrite oxidises to a variety of oxides, hydroxides
and sulfates. Associated copper minerals include the sulfides bornite
(Cu5FeS4), chalcocite (Cu2S), covellite (CuS), digenite (Cu9S5); carbonates
such as malachite and azurite, and rarely oxides such as cuprite (Cu2O).
Chalcopyrite is rarely found in association with native copper.
http://en.wikipedia.org/wiki/Chalcopyrite
Jim K
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