Figure 5

SEM images of clay mass of moderately heated Andosols in the Valley of Geysers: (a) Non-oriented clay matrix from moderately heated Andosols. (b) Pseudohexagonal crystals of kaolinite. (c) Open microcracks in clay matrix. (d) Microaggregates with sheet-like curved shape, composed of kaolinite and kaolinite-smectite particles, which form the walls of open microcracks.