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

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)

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

• Iron–sulfur protein

This set index article lists chemical compounds articles associated with the same name.
If an internal link led you here, you may wish to change the link to point directly to the intended article.