Hubnerite
Chemical Formula	MnWO4
Species	Molybdates & Tungstates
Crystal System	Monoclinic
Mohs Scale	4-4.5
Specific Gravity	7.12-7.18
Color	Yellowish brown to reddish brown, blackish brown, black; Deep red internal reflections in reflected light
Streak	Yellow to reddish brown, greenish gray
Luster	Metallic to adamantine towards resinous.
Refractive Index	nα=2.17-2.2, nβ=2.22, nγ=2.3-2.32
Diaphaneity	Transparent to translucent
Cleavage	Perfect on
Fracture	Irregular/uneven
Crystal Habit：Prismatic striated crystals, tabular to flattened, in radiating groups