Pentlandite

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Pentlandite 
Frequency common 
Hardness 3.5-4 
Density 4.6-5
Chemical Formula (Fe,Ni)9S8 
Core Elements Ni, Fe

Pentlandite is the primary ore of nickel. It typically contains substantial iron substitution impurities and moderate copper impurities. Separation of the various metals can be accomplished via the Mond Process.