wolframite

wolframite
/wool"freuh muyt', vawl"-/, n.
a mineral, iron manganese tungstate, (Fe,Mn)WO4, 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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      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.

      Wolframite consists of a mixture in varying proportions of the tungstates of iron and manganese, FeWO4 and MnWO4; varieties with dominant iron (Fe:Mn⋜4:1) are called ferberite, and those with dominant manganese (Mn:Fe⋜4:1) are called hübnerite. Wolframite's colour is brown to black, and it has a submetallic to metallic lustre and a perfect cleavage. The Mohs hardness is 5–5 1/2; specific gravity, 7–7.5; and crystal system, monoclinic.

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Universalium. 2010.

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  • wolframite — noun Etymology: German Wolframit, from Wolfram Date: circa 1868 a brown to black mineral that consists of a tungstate of iron and manganese occurring especially in monoclinic crystals and used as a source of tungsten …   New Collegiate Dictionary

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