GNU Collaborative International Dictionary of English

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1.       
   Pyrite , 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.
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   Hence sable coal his massy couch extends,
   And stars of gold the sparkling pyrite blends.
   E. Darwin.
   
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