Hausmannite is a complex oxide of manganese containing both di- and tri-valent manganese. The formula can be represented as Mn2+Mn3+2O4. Hausmannite is a brown to black metallic mineral with Mohs hardness of 5.5 and a specific gravity of 4.8. It belongs to the spinal group and forms tetragonal crystals. It is also produced by metamorphosis of manganiferous rocks. It is a primary mineral in hydrothermal veins.
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