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, Fe1−xS (where x = 0 to 0.2) (monoclinic or hexagonal) Troilite, FeS, the endmember of pyrrhotite (hexagonal) Mackinawite, Fe1+xS (where x = 0 to 0.
Rizlan Bernier-Latmani, Luca Loreggian
Karen Scrivener, Franco Alberto Zunino Sommariva