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Hausmannite

Hausmannite is a complex oxide, or a mixed oxide, of manganese containing both di- and tri-valent manganese. Its chemical formula can be represented as MnIIMnIII2O4, or more simply noted as MnO·Mn2O3, or Mn3O4, as commonly done for magnetite, the corresponding iron oxide. It belongs to the spinel group and forms tetragonal crystals. Hausmannite is a brown to black metallic mineral with Mohs hardness of 5.5 and a specific gravity of 4.8.

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File:Hausmannite-131901.jpg|Hausmannite from Wessels mine, Kalahari manganese fields, Northern Cape Province, South Africa File:Hausmannite structure.jpg|Crystal structure of hausmannite File:Hausmannite-120647.jpg|Cluster from Wessels mine, Hotazel, Kalahari manganese fields, Northern Cape Province, South Africa File:Ettringite-Hausmannite-Oyelite-Ettringite-Kalahari-Namibia-85mm 0623.jpg|Ettringite crystal on a matrix of hausmannite and hematite, coated by oyelite ==References==
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