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Pentlandite

Pentlandite is an iron–nickel sulfide with the chemical formula (Fe, Ni)₉S₈. Pentlandite has a narrow variation range in nickel to iron ratios, but it is usually described as 1:1. In some cases, this ratio is skewed by the presence of pyrrhotite... Wikipedia
Cleavage: Absent – octahedral parting on
Color: Yellowish bronze
Crystal class: Hexoctahedral (m3m); H-M symbol: (4/m 3 2/m)
Crystal habit: Hexoctahedral rare; massive to granular
Crystal system: Isometric
Density: 4.6–5 g/cm3
Diaphaneity: Opaque