Pyrrhotite is a mineral, it is also a magnetic pyrite. However, the iron content of pyrrhotite can fluctuate greatly. In crystals, pyrrhotite occurs much less frequently than in aggregates. It is used as iron ore and for the production of sulfuric acid. It has both hydrothermal and magmatic origin, depending on the rocks in which it occurs.
You can see pyrrhotite stone for sale and buy it in the Minerals of Russia online store.
|Fe1−xS (x = 0 to 0.2)|
|Crystal system||Monoclinic, with hexagonal polytypes|
|Crystal class||Prismatic (2/m)
(same H-M symbol)
|Unit cell||a = 11.88 Å, b = 6.87 Å,
c = 22.79 Å; β = 90.47°; Z = 26
|Color||Bronze, dark brown|
|Crystal habit||Tabular or prismatic in hexagonal prisms; massive to granular|
|Mohs scale hardness||3.5 – 4.5|
|Streak||Dark grey – black|
|Specific gravity||4.58 – 4.65, average = 4.61|
|Solubility||Soluble in hydrochloric acid|
|Other characteristics||Weakly magnetic, strongly magnetic on heating; non-luminescent, non-radioactive|