Pyrrhotite is a mineral with the formula Fe1-xS (x = 0 to 0.17). It has varying magnetic powers, depending on the number of Fe vacancies in the crystal structure. A related species with no vacancies (and therefore non-magnetic), is called troilite and has been found in meteorites and rarely terrestrially.
There are monoclinic and hexagonal pyrrhotite polytypes reported:
pyrrhotite-4M, Fe7S8, monoclinic;
pyrrhotite-5H, Fe9S10, hexagonal;
pyrrhotite-6M, Fe11S12, monoclinic;
pyrrhotite-7H, Fe9S10, monoclinic;
pyrrhotite-11H, Fe10S11, hexagonal.
Category: Analysed quantities
Subcategory: Grain Count
Keywords corresponding to analysed quantities. The types of analysed quantities have been grouped into eleven different subcategories. Examples: “Au”, “pH”. Taken from the “Analytical_Quantities_SHARED” database table. The subcategories are taken from the “Analytical_Quantity_Types_SHARED” database table.
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