Hausmannite
![](/Images/godic/202501/17/Hausmannit_15529.jpg")
![Crystal structure of hausmannite](/Images/godic/202501/17/Hausmannite_structure5529.jpg")
![Hausmannite from Wessels Mine, Kalahari manganese fields, Northern Cape Province, South Africa (size: 5.8 x 4.3 x 3.5 cm)](/Images/godic/202501/17/Hausmannite-1319015529.jpg")
Hausmannite is a complex oxide of manganese containing both di- and tri-valent manganese. The formula can be represented as MnMn2O4. 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.