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Hübnerite 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. Typical occurrence is in association with
high-temperature hydrothermal vein deposits and altered granites with greisen, granite
pegmatites and in alluvial deposits. (source: Wikipedia)


Photo by Michael Marcotte (showing very small silver crystals of Hübnerite on bed of quartz crystals) small crystals (silver) of Hübnerite in a matrix of quartz


Photo by iRocks at Arkenstone.com crystals of Hübnerite on quartz

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