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Hausmannite

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hausmannite [′hau̇s·mä‚nīt]
(mineralogy)
Mn3O4Brownish-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.
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Oxides of Fe, Mn, and Al Oxides such as goethite (Fe), hausmannite (Mn), and alumina (Al) have large ratios of surface area to mass, and avidly sorb Cd when the pH exceeds their respective sorption edges, i.
Modelling the effects of soil properties on the concentration of Cd ... by Milham, P.J.; Jinadasa, K.B.P.N.; Collins, D.; Nicholls, P.J.; Hawkins, C.A.; Wenzel, R.G.; Kaldor, / Australian Journal of Soil Research
2) at Jordan Mountain contains manganite intergrown with pyrolusite, and reduced amounts of hausmannite and psilomelane (Rose and Johnson 1990; Merlini 1998).
Lithology and geochemical dispersal in till: petitcodiac area, New ... by Broster, B.E.; Allaby, G.M.; Pronk, A.G. / Atlantic Geology
 
 
 
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