Tags: Chemical Substance, Mineral.
Hübnerite or hubnerite is a mineral consisting of manganese tungsten oxide (chemical formula: MnWO4 it isn’t a tungstate). 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.
