Sulfide Ores an overview ScienceDirect Topics
The most common nickel mineral in these ores is pentlandite, (Ni,Fe)9S8. The atomic ratio of nickel to iron in pentlandite ranges between 0.34 and 2.45. Most often, though, it is about 1.15. Common minerals that accompany pentlandite are pyrrhotite, Fe8S9, and chalcopyrite, CuFeS2.