Lovely specimens of Chalcopyrite roughs. Beautiful peacocked coloured stones in a natural round finish
Size: 40mm +/- approx diameter
Chalcopyrite is a copper iron sulfide mineral and the most abundant copper ore mineral. It has a brassy to golden yellow color 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 tarnishes 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). Is rarely found in association with native copper. Chalcopyrite is a conductor of electricity.
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