A new, hexagonal superstructure of pyrrhotite, with a = 2A, c = 3C (where A and C are respectively the a and c parameters of the NiAs-type sub-cell), is reported from a quenched, synthetic iron sulfide preparation containing pyrrhotite in equilibrium with pyrite. The X-ray diffraction record for it is similar to those for previously reported analogous superstructures, but exhibits reflections in positions equivalent to positions of extinction in the latter. In addition, a hexagonal superstructure with a = 2A, c = 4C is reported from a less-sulfur-rich, quenched, synthetic pyrrhotite.

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