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Definition of: pyrite
Our photo definition of pyrite 
(pī′rīt) noun plural py·ri·tes (pī·rī′tēz)
A metallic, pale brass–yellow, opaque, isometric iron disulfide, FeS2; fool's gold; iron pyrites. [<L pyrites <Gk. pyritēs flint <pyritēs (lithos) fire (stone) <pyr fire]
—py·rit′ic (-rit′ik) or ·i·cal adjective
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