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 and hübnerite often contain both divalent cations of iron and manganese, with wolframite as the intermediate species for which the...
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http://en.wikipedia.org/wiki/Ferberite
iron-rich variety of the mineral wolframite (q.v.).[1 related articles]
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http://www.britannica.com/eb/a-z/f/17
Ferberite is the chief ore of tungsten. It is a rare mineral found usually in pegmatite dikes and high- temperature quartz veins associated with granite. It has the formulae FeWO4 - MnWO4 and a relative hardness of 6.
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http://www.probertencyclopaedia.com/browse/HF.HTM
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