Ferberite
Chemical Formula	FeWO4
Species	Molybdates & Tungstates
Crystal System	Monoclinic
Mohs Scale	4
Specific Gravity	7.6
Color	Black; dark brown in transmitted light
Streak	Brownish black to black
Luster	Adamantine, Metallic, Sub-Metallic
Refractive Index	n = 2.255 n = 2.305 n = 2.414
Diaphaneity	Opaque
Cleavage	PerfectPerfect on
Fracture	Irregular/Uneven
Crystal Habit：Crystals wedge-shaped, commonly flattened and elongated or, less commonly, along . Crystal faces striated parallel or ; as groups of bladed crystals; less often short prismatic [001] and flattened {100}. Massive.
Geological Setting：High temperature hydrothermal veins, greisens, granitic pegmatites.