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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]