Source: 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]