Iron sulfide
Iron sulfide or Iron sulphide refers to a chemical compound of iron and sulfur with a wide range of stoechiometric formulae and different crystalline structures.
Natural minerals
By increasing order of stability:
- Iron(II) sulfide, FeS, the less stable amorphous form;
- Troilite, FeS, the end member of pyrrhotite;
- Greigite, Fe3S4, analog to magnetite, Fe3O4;
- Pyrrhotite, Fe1-xS (where x = 0 to 0.2), or Fe7S8;
- 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 end member.
Artificial product
- Iron(III) sulfide, Fe2S3, a quite unstable artificial product synthesised at –20 °C and not identified in nature.