Hübnerite: Difference between revisions
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*[http://webmineral.com/data/Hubnerite.shtml webmineral.com] | *[http://webmineral.com/data/Hubnerite.shtml webmineral.com] | ||
*[http://www.mindat.org/min-1940.html Mindat data] | *[http://www.mindat.org/min-1940.html Mindat data] | ||
[[Category:Manganese minerals]] | [[Category:Manganese minerals]] | ||
[[Category:Tungstate minerals]] | [[Category:Tungstate minerals]] | ||
Revision as of 17:42, 23 March 2009
Hübnerite or hubnerite is a mineral consisting of manganese tungstate (chemical formula: MnWO4). It is the manganese endmember of the manganese - iron wolframite solid solution series. It forms reddish brown to black monoclinic prismatic submetallic crystals. The crystals are typically flattened and occur with fine striations. It has a high specific gravity of 7.15 and a Mohs hardness of 4.5. It is transparent to translucent with perfect cleavage. Refractive index values are nα=2.170 - 2.200, nβ=2.220, and nγ=2.300 - 2.320.
Typical occurrence is in association with high-temperature hydrothermal vein deposits and altered granites with greisen, granite pegmatites and in alluvial deposits.
It was first described in 1865 and named after the German mineralogist, Adolf Huebner.