Hübnerite or hubnerite is a mineral consisting of manganese tungsten oxide (chemical formula MnWO4).

It forms reddish brown to black monoclinic prismatic submetallic crystals.

It occurs associated with cassiterite, arsenopyrite, molybdenite, tourmaline, topaz, rhodochrosite and fluorite.

[2] It was first described in 1865 for an occurrence in the Erie and Enterprise veins, Mammoth district, Nye County, Nevada, and named after the German mining engineer and metallurgist, Adolf Hübner from Freiberg, Saxony.

It is usually identified by the dark color, one direction of perfect cleavage and high specific gravity all serving to distinguish it from other minerals.

The predominance of either iron or manganese results in formation of one of two minerals, the compositional end-members FeWO4 (ferberite) and MnWO4 (hübnerite), respectively.

Hübnerite is a rare end-member of the wolframite group, and has the same crystal structure as other members of the family.

The crystal structure contains distorted tetrahedral (WO4) and octahedral ((Fe, Mn)O6) units.

[7] In most cases, wolframite is found embedded in quartz as subparallel crystalline masses.

Hübnerite does not occur on its own,[7] but is typically associated with other minerals such as cassiterite, scheelite, quartz, galena, arsenopyrite, native bismuth, pyrite, and sphalerite.