Montmorillonite: electron-optical observations.
Fine-grained micas are consistent impurities in Camp-Berteaux (Morocco) and Wyoming montmorillonities. These micas give selected-area electron diffraction spot patterns with triclinic, monoclinic, and hexagonal symmetries similar tO those reported previously for monmorillonites. Camp-Berteaux montmorillonite appears as folded and flexible polycrystalline aggregates with pronounced texturing along the [02],[11], and[1ī] directions. Wyoming montmorillonite displays better crystallinity and larger crystallite size, and its structure is no longer truly "turbostratic".
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