pentlandite

{{Infobox mineral | name = Pentlandite | category = Sulfide mineral | boxwidth = | image = Pentlandite, Pyrrhotite-540342|300px | caption =3.1 × 2.6 cm mass of pentlandite with some pyrrhotite | formula = iron nickel sulfide: | IMAsymbol=Pn | strunz = 2.BB.15a | system = Isometric |dana=2.7.1.1| class = Hexoctahedral (mm) H-M symbol: (4/m 2/m) | symmetry = Fmm |unit cell=a = 9.928 Å, Z = 4|molweight=771.94 g/mol| color = Yellowish bronze | habit = Hexoctahedral rare; massive to granular | cleavage = Absent – octahedral parting on {111} | fracture = Conchoidal |tenacity=Brittle| mohs = 3.5–4 | luster = Metallic | pleochroism = | streak = Light bronze-brownGreenish black | gravity = 4.6–5.0 |density=4.6–5 g/cm3| melt = | fusibility = 1.5–2 | solubility = |diaphaneity=Opaque| other = Becomes magnetic upon heating | references = }}

thumb|Pentlandite in pyrrhotite, ore specimen from the [[Sudbury Basin (field of view 3.4 cm)|300x300px]] Pentlandite is an iron–nickel sulfide with the chemical formula . Pentlandite has a narrow variation range in nickel to iron ratios (Ni:Fe), but it is usually described as 1:1. In some cases, this ratio is skewed by the presence of pyrrhotite inclusions. It also contains minor cobalt, usually at low levels as a fraction of weight.