Habit: Yellowish to reddish brown, blackish brown or black; rarely red. Crystals typically prismatic and striated, also tabular to bladed; in radiating groups and in parallel. Adamantine, resinous or metallic luster; transparent to translucent. Reddish brown streak.
Environment: Occurs in high-temperature hydrothermal veins and pneumatolytically altered granites yielding greisen, in granite pegmatites and in alluvial and eluvial deposits.
Etymology: Named in honor of Adolph Hübner, a mining engineer and metallurgist of Freiberg, Germany.