wolframite

from WordNet (r) 3.0 (2006)

wolframite
    n 1: a mineral consisting of iron and manganese tungstate in
         crystalline form; the principal ore of tungsten; found in
         quartz veins associated with granitic rocks [syn:
         {wolframite}, {iron manganese tungsten}]

from The Collaborative International Dictionary of English v.0.48

Wolframite \Wol"fram*ite\, n. [G., wolframit, wolfram; wolf wolf
   + rahm cream, soot; cf. G. wolfsruss wolfram, lit., wolf's
   soot.] (Min.)
   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}.
   [1913 Webster]