Wolframite

Wolframite is a type of ore. It is not a single mineral, but a solid solution of hübnerite (manganese(II) tungstate, MnWO
4) and ferberite (iron(II) tungstate, FeWO
4). Wolframite is one of two main ores of tungsten. The other is scheelite.

It is a black or brown mineral.

Wolframite Media

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  Diagram of wolframite crystal's front view

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  Extraction of tungsten from wolframite ore

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  Tungstic Acid (WO3) in powder form