Hausmannite

Hausmannite N’Chwaning II Mine, Kuruman, Kalahari manganese fields, Northern Cape Province, South Africa Specimen weight:10 gr. Crystal size:Up to 1,0 cm Overall size: 22mm x 20 mm x 28 mm © minservice
Chemical Formula: Mn2+Mn23+O4
Locality: Ilmenau and nearby at Orenstock, in Thuringia, Germany.
Name Origin: Named after the German mineralogist, J. F. L. Hausmann (1782-1859).
Hausmannite is a complex oxide of manganese containing both di- and tri-valent manganese. The formula can be represented as Mn2+Mn23+O4. 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. Locations include Batesville, Arkansas, USA; Ilfeld, Germany; Langban, Sweden; and the Ural Mountains, Russia. The best samples have been found in South Africa and Namibia where it is associated with other manganese oxides, pyrolusite and psilomelane and the iron-manganese mineral bixbyite. Wilhelm Haidinger (1827) named it in honour of Johann Friedrich Ludwig Hausmann (1782–1859), professor of mineralogy, University of Göttingen, Germany.

Physical Properties

Cleavage: {001} Perfect
Color: Brownish black, Grayish.
Density: 4.7 – 4.84, Average = 4.76
Diaphaneity: Opaque
Fracture: Uneven – Flat surfaces (not cleavage) fractured in an uneven pattern.
Hardness: 5.5 – Knife Blade
Luminescence: Non-fluorescent.
Luster: Sub Metallic
Magnetism: Nonmagnetic
Streak: dark reddish brown

Photos :

Hausmannite Wessels mine – Hotazel – Kalahari manganese fields – Northern Cape prov. – South Africa Specimen weight:306 gr. Crystal size:mm. 12 x 15 Overall size: 56mm x 56 mm x 50 mm © minservice
Hausmannite N’Chwaning II Mine, Kuruman, Kalahari manganese fields, Northern Cape Province, South Africa Size: 3.0 x 2.0 x 2.0 cm (thumbnail) © danweinrich
Hausmannite N’Chwaning II Mine – South Africa Specimen weight:78 gr. Crystal size:8 mm Overall size: 45mm x 45 mm x 38 mm © minservice
N’Chwaning II Mine, N’Chwaning Mines, Kuruman, Kalahari manganese field, Northern Cape Province, South Africa © 2009 Michael C. Roarke
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