Wolframite
intermediate mineral variety between hübnerite and ferberite From Wikipedia, the free encyclopedia
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Wolframite is a type of ore. It is not a single mineral, but a solid solution of hübnerite (manganese(II) tungstate, MnWO4) and ferberite (iron(II) tungstate, FeWO4). Wolframite is one of two main ores of tungsten. The other is scheelite.
It is a black or brown mineral.
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