scheelite

from WordNet (r) 3.0 (2006)

scheelite
    n 1: a mineral used as an ore of tungsten

from The Collaborative International Dictionary of English v.0.48

Scheelite \Scheel"ite\, n. [From C.W. Scheele, a Swedish
   chemist.] (Min.)
   Calcium tungstate, a mineral of a white or pale yellowish
   color and of the tetragonal system of crystallization.
   [1913 Webster]