Thanks George, What range would the copper content of this substance be? Cheers According to Wiki:
Chalcopyrite (pronounced /ˌk?lkɵˈpaɪraɪt/ KAL-ko-PYE-ryet) is a copper iron sulfide mineral that crystallizes in the tetragonal system. It has the chemical composition CuFeS2.
It has a brassy to golden yellow colour and a hardness of 3.5 to 4 on the Mohs scale. Its streak is diagnostic as green tinged black.
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
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