[wool-fruh-mahyt, vawl-]
a mineral, iron manganese tungstate, (Fe,Mn)WO 4 , occurring in heavy grayish-black to brownish-black tabular or bladed crystals: an important ore of tungsten.
Also, wolfram.

1865–70; wolfram + -ite1

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World English Dictionary
wolframite (ˈwʊlfrəˌmaɪt)
a black to reddish-brown mineral consisting of tungstates of iron and manganese in monoclinic crystalline form: it occurs mainly in quartz veins and is the chief ore of tungsten. Formula: (Fe,Mn)WO4

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Encyclopedia Britannica


chief ore of tungsten, commonly associated with tin ore in and around granite. Such occurrences include Cornwall, Eng.; northwestern Spain and northern Portugal; eastern Germany; Myanmar (Burma); the Malay Peninsula; and Australia.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Scheelite and wolframite are the principal minerals currently mined for tungsten.
Large imperfect crystals of wolframite embedded in quartz and chalcopyrite.
Two kinds of tungsten-bearing mineral rocks, called wolframite and scheelite, are mined commercially.
Quartz-wolframite, quartz-sulfide, and quartz-carbonate stages are identified.
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