16 Photos
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.

Ferberite is the iron endmember of the manganese - iron wolframite solid solution series. The manganese endmember is hübnerite. Ferberite is a black monoclinic mineral composed of iron(II) tungstate, FeWO₄.

Ferberite occurs as granular masses and as slender prismatic crystals. It has a Mohs hardness of 4.5 and a specific gravity of 7.4 to 7.5. Ferberite typically occurs in pegmatites, granitic greisens, and high temperature hydrothermal deposits. It is a minor ore of tungsten.

Ferberite was discovered in 1863 in Sierra Almagrera, Spain, and named after Moritz Rudolph Ferber (1805-1875).