Forms of Iron Sulfide
"Iron sulfide" exists in several distinct forms, which differ in the ratio of sulfur to iron and properties:
- Pyrrhotite, Fe1-xS, a mineral, which displays ferrimagnetism and crystallizes in monoclinic system. Iron metal shows ferromagnetism; iron sulfides do not.
- Troilite, FeS, a stoichiometric compound that adopts hexagonal symmetry.
- Mackinawite, Fe1+xS the least stable form of iron sulfide; mackinawite has a layered structure.
- Pyrite and marcasite, which are diamagnetic minerals, have the formula FeS2.
- Greigite (Fe3S4) a ferromagnetic species akin to magnetite (Fe3O4).
Read more about this topic: Iron(II) Sulfide
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