Wolframite
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Wolframite (Fe,Mn)WO₄, is a mineral that is the intermediate between Ferberite and Huebernite. Along with Scheelite, the Wolframite series are the most important tungsten ore. China reportedly has the world's largest supply of tungsten ore.

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The original article can be found at: http://en.wikipedia.org/wiki/Wolframite.
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