抄録
Clay minerals obtained from the weathering product of Ohya-ishi were examined by high resolution electron microscopy and selected area electron diffraction. Some mica crystals showed a unique morphology, They were very thin along the b-axis compared with c-axis. A high resolution electron micrograph showed a microstructure reflecting the arrangement of the tetrahedra in the unit layers of mica. Montmorillonite flakes showed a crossed lattice image of 4.5 Å spacing. A local ordering of unit layers in montmorillonite flakes was discussed.
