Hausmannite is a complex oxide of manganese containing both

di- Numeral or number prefixes are prefixes derived from numerals or occasionally other numbers. In English and many other languages, they are used to coin numerous series of words. For example: * unicycle, bicycle, tricycle (1-cycle, 2-cycle, 3-cyc ...

and tri-valent manganese. The formula can be represented as Mn²⁺Mn³⁺₂O₄. 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. The type locality is Oehrenstock (Öhrenstock), Ilmenau, Thuringian Forest,

Thuringia, Germany Thuringia (; german: Thüringen ), officially the Free State of Thuringia ( ), is a state of central Germany, covering , the sixth smallest of the sixteen German states. It has a population of about 2.1 million. Erfurt is the capital and lar ...

, where it was first described in 1813. Locations include Batesville, Arkansas, US; Ilfeld, Germany; Langban,

Sweden Sweden, formally the Kingdom of Sweden,The United Nations Group of Experts on Geographical Names states that the country's formal name is the Kingdom of SwedenUNGEGN World Geographical Names, Sweden./ref> is a Nordic country located on ...

; and the Ural Mountains, Russia. High quality samples have been found in South Africa and Namibia where it is associated with other manganese oxides,

pyrolusite Pyrolusite is a mineral consisting essentially of manganese dioxide ( Mn O2) and is important as an ore of manganese.. It is a black, amorphous appearing mineral, often with a granular, fibrous, or columnar structure, sometimes forming reniform ...

and psilomelane and the iron-manganese mineral bixbyite.

Wilhelm Haidinger Wilhelm Karl Ritter von Haidinger (or Wilhelm von Haidinger, or most often Wilhelm Haidinger) (5 February 179519 March 1871) was an Austrian mineralogist. Early life Haidinger's father was the mineralogist Karl Haidinger (1756–1797), who died wh ...

(1827) named it in honour of Johann Friedrich Ludwig Hausmann (1782–1859), Professor of Mineralogy, University of Göttingen, Germany.

Image gallery

Northern Cape Province, South Africa Image: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

Manganese(II,III) minerals Spinel group Tetragonal minerals Minerals in space group 141 {{mineral-stub