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Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures
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Montmorillonite: electron-optical observations.

N Güven

    Science (New York, N.Y.)
    |September 14, 1973
    PubMed
    Summary
    This summary is machine-generated.

    Fine-grained micas are common impurities in Moroccan and Wyoming montmorillonites. These mica impurities influence the crystal structure and diffraction patterns observed in these clay minerals.

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    Area of Science:

    • Mineralogy and Clay Science
    • Geochemistry
    • Materials Science

    Background:

    • Montmorillonites are clay minerals known for their variable structures and applications.
    • Fine-grained micas are frequently found as impurities in various geological formations.
    • Understanding the influence of impurities on clay mineral structures is crucial for geological and materials science applications.

    Purpose of the Study:

    • To investigate the presence and impact of fine-grained micas as impurities in Camp-Berteaux (Morocco) and Wyoming montmorillonites.
    • To analyze the crystallographic and structural characteristics of these montmorillonites influenced by mica impurities.
    • To compare the structural differences between montmorillonites from different geological locations when containing similar impurities.

    Main Methods:

    • Selected-area electron diffraction (SAED) was employed to analyze the crystallographic symmetries of the micas and montmorillonites.
    • Microstructural observations were conducted to characterize the morphology and texture of the clay aggregates.
    • Crystallinity and crystallite size were assessed to differentiate between the structural properties of the studied samples.

    Main Results:

    • Fine-grained micas were identified as consistent impurities in both Camp-Berteaux and Wyoming montmorillonites.
    • SAED patterns revealed triclinic, monoclinic, and hexagonal symmetries associated with the mica impurities, consistent with previous montmorillonite studies.
    • Camp-Berteaux montmorillonite exhibited folded, flexible polycrystalline aggregates with significant texturing, while Wyoming montmorillonite showed improved crystallinity and larger crystallite size, deviating from a turbostratic structure.

    Conclusions:

    • Fine-grained micas are ubiquitous impurities in the studied montmorillonites, significantly influencing their structural and diffraction characteristics.
    • The presence of mica impurities affects the observed symmetries and microstructural features of montmorillonites.
    • Differences in crystallinity and structural order between the Moroccan and Wyoming samples are highlighted, suggesting varying geological formation conditions or post-depositional histories.