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Four models of vermiculite interlayer space arrangement: (a) corresponding to the basal distance c = 14.4 Å; (b) corresponding to the basal distance c = 12.1 Å; (c) corresponding to the basal distance c = 9.9 Å in vermiculite thermally treated at 500 °C and 700 °C; (d) Model of a single 2:1 layer showing the positions of atoms in the tetrahedral (T) and octahedral (O) sheets. The color legend for all atoms occurring in the models is below the image.
