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Webster 1913 Edition

Noun.

;

pl.

Pyrites

(#)

[Cf. F.

pyrite

. See

(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.

Noun.

plu.

pyrites. [Gr., fire.] Fire-stone; a genus of inflammable substances composed of sulphur and iron or other metal; a sulphuret of iron or other metal.

Hence sable coal his massy couch extends, and stars of gold the sparkling pyrite blends.

[I have anglicized this word, according to Darwin and the French mineralogists; making pyrites a regular plural.]