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Photo of peacock ore

Chalcopyrite

Chalcopyrite is a mixture of copper, iron and sulphur. In this more copper-rich form, it should really be called bornite, but is probably better known as peacock ore. You can see why. The bright colours are down to a tarnish that forms fairly quickly on exposed surfaces. These are from Mapimi, in Durango, Mexico. 

3-4cm



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