Iron sulfide

Iron sulfide or Iron sulphide can refer to range of chemical compounds composed of iron and sulfur.

Minerals

By increasing order of stability:

Iron(II) sulfide, FeS
Greigite, Fe₃S₄ (cubic)
Pyrrhotite, Fe_1−xS (where x = 0 to 0.2) (monoclinic or hexagonal)
Troilite, FeS, the endmember of pyrrhotite (hexagonal)
Mackinawite, Fe_1+xS (where x = 0 to 0.1) (tetragonal)
Marcasite, orthorhombic FeS₂
Pyrite, cubic FeS₂ (fool's gold)
Arsenopyrite (mispickel), FeAsS, or Fe(As-S), Fe(III) mixed arseno-sulfide (monoclinic)

Synthetic

Iron(III) sulfide, Fe₂S₃
Iron-sulfur clusters, includes both synthetic and biological

Biological

Iron–sulfur protein

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