n.
Most common copper mineral, a copper and iron sulfide (CuFeS 2 ), and a very important copper ore.
It typically occurs in ore veins deposited at medium and high temperatures, as in parts of Spain, Japan, Montana, and Missouri. Chalcopyrite is a member of a group of sulfide minerals , and it crystallizes in the tetragonal crystal system. Its atomic structure is related to that of sphalerite .