Meaning of pyrite

py•rite

Pronunciation: (pī'rīt), [key]
— n.
  1. a very common brass-yellow mineral, iron disulfide, FeS, with a metallic luster, burned to sulfur dioxide in the manufacture of sulfuric acid: chemically similar to marcasite, but crystallizing in the isometric system.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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