Fig. 4. Scanning electron micrographs of the medium clay fraction from the Webster soil; (A) low magnification scanning electron microscopy (SEM) illustrating numerous large (5–20 µm) and small (1–2 µm) particles, (B) medium magnification SEM stereo pair illustrating typical large particles covered with small particles, and (C) high magnification SEM stereo pair of small protoillite and smectite particles.

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