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The phases contained in iron/sulphur mixtures corresponding to bulk composition Fe7S8, sintered at 500 C, depend on the thermal treatment. Prolonged annealing of the sintered material at 250 C produces essentially ideal monoclinic pyrrhotite. Quenching from 500 C produces predominantly hexagonal pyrrhotite, Fe9S10. Cooling from 500 C at 10 C min-1 produces a non-ideal monoclinic pyrrhotite that does not have the fully developed doublet in the X-ray diffraction pattern that is characteristic of ideal monoclinic pyrrhotite. That the slow-cooled material is a mixture of monoclinic and hexagonal pyrrhotite is indicated by repeated thermomagnetic runs. These reveal a thermal stability intermediate between monoclinic pyrrhotite, the stability of which is indicated by repeatable thermomagnetic curves, and hexagonal pyrrhotite, the magnetization of which increases substantially during heating due to transformation to the monoclinic phase

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