Marcasite meaning

mär'kə-sīt', -zīt'
A mineral with the same composition as pyrite, FeS2 , but differing in crystal structure.
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An ornament of pyrite, polished steel, or white metal.
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An orthorhombic mineral, FeS2, that is dimorphic with pyrite; iron sulfide.
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This mineral cut and mounted on silver or other white metal to look like brilliants.
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A light yellow to gray, metallic, orthorhombic mineral. Marcasite is a polymorph of pyrite and looks similar to it but has a lower specific gravity, is paler in color, and often has a radiating fibrous structure. Chemical formula: FeS2.
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(geology) A pale mineral, FeS2. Marcasite is physically and crystallographically distinct from pyrite, although the two have the same chemical composition.
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Origin of marcasite

  • Middle English from Medieval Latin marcasīta from Arabic marqašīṯā from Aramaic marqəšitā from Akkadian marḫašu from marḫaši ancient region in the eastern Iranian plateau
    From American Heritage Dictionary of the English Language, 5th Edition