From The Collaborative International Dictionary of English v.0.48:

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.
   [1913 Webster]
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