Marcasite

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The mineral marcasite, sometimes called “white iron pyrite”, is iron sulfide (FeS2) with orthorhombic crystal structure. It is physically and crystallographically distinct from pyrite, which is iron sulfide with cubic crystal structure. Both structures contain the disulfide S22− ion, having a short bonding distance between the sulfur atoms. The structures differ in how these di-anions are arranged around the Fe2+ cations. Marcasite is lighter and more brittle than pyrite. Specimens of marcasite often crumble and break up due to the unstable crystal structure.

On fresh surfaces, it is pale yellow to almost white and has a bright metallic luster. It tarnishes to a yellowish or brownish color and gives a black streak. It is a brittle material that cannot be scratched with a knife. The thin, flat, tabular crystals, when joined in groups, are called “cockscombs”.
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  • Markazit

    Markazit

    Cm-es dárdakovandok

    Object information
    Image: Berentés Ágnes - CC BY-NC-SA

  • Markazit

    Markazit

    2-3 mm-es, szürke, gömbös...

    Object information
    Image: Herman Ottó Múzeum - CC BY-NC-SA

  • Pirit, markazit

    Pirit, markazit

    Kalcitra nőtt gömbös...

    Object information
    Image: Herman Ottó Múzeum - CC BY-NC-SA

  • Markazit

    Markazit

    Mocsárcipruson apró...

    Object information
    Image: Herman Ottó Múzeum, Miskolc - CC BY-NC-SA

  • Markazit

    Markazit

    Mm alatti, fénylő, aranysárga...

    Object information
    Image: Herman Ottó Múzeum, Miskolc - CC BY-NC-SA

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