Hausmannite


Also found in: Dictionary, Thesaurus, Wikipedia.
Related to Hausmannite: Braunite, manganite

hausmannite

[′hau̇s·mä‚nīt]
(mineralogy)
Mn3O4 Brownish-black, opaque mineral composed of manganese tetroxide.

Hausmannite

 

(named for the German mineralogist J. F. L. Hausmann, 1782-1859), a mineral having the composition MnMn2O4, containing 31 percent MnO and 69 percent Mn2O3. It crystallizes in a tetragonal system, close to spinel in structure. It is usually found in the form of granular aggregates, less commonly as crystals of octahedral appearance. It is black in color, with a hardness on the mineralogical scale of 5-5.5 and a density of 4,700-4,900 kg/m3. It is nonmagnetic. Hausmannite forms in metamorphosed sedimentary, contact-metasomatic, and hydrothermal deposits of manganese ores. It is the chief ore-bearing mineral of some manganese deposits in the Urals, such as Sapal’skoe, and in Kazakhstan, such as Naizatas. The industrial importance of hausmannite ores is limited; they are used in ferrous metallurgy for smelting ferromanganese or for lining in smelting pig iron.

References in periodicals archive ?
These studies revealed the composition of Hausmannite and Braunite as major manganese minerals(Table-1).
The mineralogical studies of Bajaur Agency manganese deposits revealed the presence of Mn oxide and Mn silicate minerals comprising of Hausmannite and Braunite respectively.
1 million square meters, and produced chiefly pyrolusite and hausmannite ore from irregular stringers and pods (Rumscheidt, 1926).
The manganese ore species of the veins are braunite, hausmannite, cryptomelane, "wad" and most commonly, and of greatest economic significance, pyrolusite and manganite.
Hausmannite was one of the more abundant manganese ore species in the Ilfeld district, occurring in gray, foliated masses and in compact masses of radiating acicular crystals.
Before the wonderful hausmannite specimens of the N'Chwaning and Wessels mines in South Africa began emerging in the early 1990s, the finest "classic" hausmannites came from Ohrenstock/Ilmenau and from the manganese orebody at Langban, Sweden, both localities having produced specimens showing sharp hausmannite crystals to 2 cm.
Very rarely, rhodochrosite forms pseudomorphs after microcrystals of manganite and hausmannite (www.
In 2003 there was a significant dump find of specimens showing hausmannite pseudomorphs after manganite, with dull black, prismatic pseudocrystals shot through, or protruding from, massive manganese oxide matrix.
It occurred very sparingly at the surface of cavities and fractures in a manganese ore containing tephroite, bementite, braunite, hausmannite and hematite.
Hausmannite is a common species, especially at the Gambatesa mine.
The Gambatesa mine produced some specimens of pale amethyst quartz associated with tephroite and hausmannite.
Good specimens were collected in 1999--2000 from the hausmannite ore of the Gambatesa mine.