Source : Webster's Revised Unabridged Dictionary (1913)

Barite \Ba"rite\, n. (Min.)
   Native sulphate of barium, a mineral occurring in
   transparent, colorless, white to yellow crystals (generally
   tabular), also in granular form, and in compact massive forms
   resembling marble. It has a high specific gravity, and hence
   is often called {heavy spar}. It is a common mineral in
   metallic veins.

Source : WordNet®

barite
     n : a white or colorless mineral (BaSO4); the main source of
         barium [syn: {heavy spar}, {barytes}, {barium sulphate}]