marcasite definition

  • noun:
    • A mineral with similar structure as pyrite, FeS2, but differing in crystal structure. Also called white iron pyrites.
    • An ornament of pyrite, polished metallic, or white material.
    • A pale mineral, FeS2. Marcasite is actually and crystallographically distinct from pyrite, even though two have the same chemical composition.
    • A sulphide of iron resembling pyrite or common iron pyrites in structure, but differing in type; white iron pyrites.
    • As employed by the early mineralogists, the crystallized kinds of iron pyrites, including even more specially the isometric types today known as pyrite.
    • In recent usage, the orthorhombic iron pyrites, or iron disulphid, FeS2.

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