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From Longman Dictionary of Contemporary English
Related topics: Geology
pyritespy‧ri‧tes /paɪˈraɪtiːz $ pə-/ noun [uncountable]  pyrite.jpg HEGa mix of sulphur with a type of metal, usually iron, or iron and copperfool’s gold iron pyrites
Examples from the Corpus
pyritesWhen the wetlands are drained the iron pyrites in the soil are exposed to air and form sulphur acid.The scientists warn that the deposits of pyrites are too large to neutralize by liming.
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