Source : Webster's Revised Unabridged Dictionary (1913)

Chalcopyrite \Chal`co*pyr"ite\, n. [Gr. chalko`s brass + E.
   pyrite. So named from its color.] (Min.)
   Copper pyrites, or yellow copper ore; a common ore of copper,
   containing copper, iron, and sulphur. It occurs massive and
   in tetragonal crystals of a bright brass yellow color.

Source : WordNet®

chalcopyrite
     n : a yellow copper ore (CuFeS2) made up of copper-iron sulfide
         [syn: {copper pyrites}]