Pyr"ite (?), 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.
Hence sable coal his massy couch extends,
And stars of gold the sparkling pyrite blends.
E. Darwin.
© Webster 1913.