By increasing order of stability:
- Iron(II) sulfide, FeS, the less stable amorphous form;
- Greigite, a form of iron(II,III) sulfide (Fe3S4), analog to magnetite, Fe3O4;
- Pyrrhotite, Fe1−xS (where x = 0 to 0.2), or Fe7S8;
- Troilite, FeS, the endmember of pyrrhotite;
- Mackinawite, Fe1+xS (where x = 0 to 0.1);
- Marcasite, or iron(II) disulfide, FeS2 (orthorhombic);
- Pyrite, or iron(II) disulfide, FeS2 (cubic), the more stable endmember, known as fool's gold.
- Iron(III) sulfide, Fe2S3, a quite unstable artificial product synthesised at –20 °C and not identified in nature.
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