%pyrite%

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 ]

n. [ Leuco- + pyrites. ] (Min.) A mineral of a color between white and steel-gray, with a metallic luster, and consisting chiefly of arsenic and iron. [ 1913 Webster ]

{ } n. [ NL. Melampyrum cowwheat; Gr. me`las black + pyro`s wheat. ] (Chem.) The saccharine substance dulcite; -- so called because found in the leaves of cowwheat (Melampyrum). See Dulcite. [ 1913 Webster ]

n.; pl. Pyrites [ Cf. F. pyrite. See Pyrites. ] (Min.) A common mineral of a pale brass-yellow color and brilliant metallic luster, crystallizing in the isometric system; iron pyrites; iron disulphide. [ 1913 Webster ]

Hence sable coal his massy couch extends,
And stars of gold the sparkling pyrite blends. E. Darwin. [ 1913 Webster ]