PYRRHOTITE C??? ??, ??, ??

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Brownish-bronze color, black streak, metallic luster. Slightly magnetic. Hardness 4.

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Habit: tabular, platy, massive, granular.
Color: bronze yellow or red.
Diaphaneity: opaque.
Luster: metallic.
Cleavage: (0001) imperfect, (1120) poor.
Fracture: uneven.
Streak: gray black. Electrical resistivity 2 to 160 μΩ.cm.
Occurrence: wide spread occurrences in igneous and metamorphic rocks. Magnetic.

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Ore of iron, manufacture of sulfuric acid.

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A natural iron sulfide. Frequently has a deficiency in iron. May contain small amounts of nickel, cobalt, manganese, and copper.

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Pyrrhotite is a sulphide residue which is recovered from sulphides in a process of sulphuric acid production

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