wolframite

(-frə mīt′)

noun

a semihard, heavy, dark-colored, monoclinic mineral, (Fe,Mn)WO, the chief ore of tungsten; iron manganese tungstate

Origin: Ger wolframit: see wolfram

See wolframite in American Heritage Dictionary 4

noun

Any of several red-brown to black minerals with the general formula (Fe,Mn)WO₄, which constitute a major source of tungsten.

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