Fig. 2. Transmission electron micrographs of the clay fraction of selected soil horizons: (a) smooth and curved fibres of imogolite in the 3Bw1 horizon of Pedon 2; (b) aggregates of spherical, ring-shaped particles of allophane in the 2C horizon of Pedon 4; (c) spheroids and tubes of halloysite in the 4Bw2 horizon of Pedon 1; and (d) tubes of halloysite in the Bw horizon of Pedon 4.

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