Ferberite

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) and 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.

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

References

* Web Mineral site
* Mindat mineral data
* galleries.com

List of minerals