Silicates Sheet silicates Crystal structure TEM data Mica group Polytypism X-ray diffraction data Clay minerals SEM data Clay mineralogy Electron diffraction data High-resolution methods Kaolinite Geochemistry Metals Order-disorder Experimental studies Biotite Cell dimensions Crystal chemistry Dickite Morphology Serpentine group Chlorite group Clastic sediments Cronstedtite Electron microscopy data Kaolin Sample preparation Sediments