Word Study
chalcopyrite
CIDE DICTIONARY
chalcopyrite, n. [Gr. chalko`s brass + E. pyrite. So named from its color.].
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]
OXFORD DICTIONARY
chalcopyrite, n. a yellow mineral of copper-iron sulphide, which is the principal ore of copper.
Etymology
Gk khalkos copper + PYRITE
For further exploring for "chalcopyrite" in Webster Dictionary Online