Minerals (Category B)
BORNITE IS a sulfide mineral and one of the important copper ore mineral. It crystallizes in the cubic system. On fresh surfaces, it has a brown to copper-red color which tarnishes to an irrdescent purple surface. Due to the purple to bronze irridescence, it is also called 'peacock ore.'
Bornite widely occurs in porphyry copper deposits along with chalcopyrite. Both the chalcopyrite and bornite are typically replaced by chalcocite and covellite in supergene enrichment zone of copper deposits. It is also found in pegmatites.