Wolframite
Wolframite , noun
[German, wolframit, wolfram; wolf wolf + rahm cream, soot; compare German wolfsruss wolfram, lit., wolf's soot.]
(Mineralogy) 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.