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Definition of: marcasite
(mär′kə·sīt) noun
1. A pale, bronze–yellow, orthorhombic iron disulfide, FeS2; white iron pyrites. It is a dimorphous form of pyrites.
2. An ornament made of crystallized white pyrites or of highly polished steel. [<Med. L marcasita, prob. <Arabic marqashīṭā <Aramaic]
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