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

n. A mineral that consists of a tungstate of iron and manganese; (Fe,Mn)WO4.

n. Tungstate of iron and manganese, generally of a brownish or grayish black color, submetallic luster, and high specific gravity. It occurs in cleavable masses, and also crystallized. Called also wolfram.

n. See wolfram.

n. a mineral consisting of iron and manganese tungstate in crystalline form; the principal ore of tungsten; found in quartz veins associated with granitic rocks

"The minerals in question—cassiterite, columbite-tantalite, gold and wolframite—are widely used in consumer electronics and other products, although Congo supplies no more than 20% of global demand for these raw materials."

mineral   

wolfram   

manganowolframite