A review on the mineral chemistry of the non-stoichiometric iron sulphide, Fe₁₋<b><i>_x</i></b>S (0 ≤ <b><i>x</i></b> ≤ 0.125): polymorphs, phase relations and transitions, electronic and magnetic structures

Fe1− x S (0 ≤ x ≤ 0.125), the pyrrhotite group minerals are extremely complex in their chemical and physical properties, which largely attribute to the various non-stoichiometric compositions and myriad superstructures. In this article, a review is focused on the crystal structures, phase relations and transition of the pyrrhotite group minerals.

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