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A brass-colored mineral, FeS2, occurring widely and used as an iron ore and in producing sulfur dioxide for sulfuric acid. Also called fool's gold, iron pyrites.
[Middle English perides, pirite, from Old French pirite, from Latin pyrītēs, flint; see pyrites.]
py·rit′ic (-rĭt′ĭk), py·rit′i·cal (-ĭ-kəl) adj.
(Minerals) mineralogy relating to pyrites