The NiAs structure of stoichiometric troilite FeS. In nonstoichiometric monoclinic pyrrhotite Fe7S8 the cation layers (hatched circles) are believed to be alternatively filled and partly filled. The adjacent layers have opposing and unequal magnetizations that lie in the basal planes (like hematite, ).
The pyrrhotites Fe 1-x S (0 < x
< 0.13) crystallize in the NiAs structure ( Fig.
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