Fig. 3. X-ray diffractograms (Cu K radiation) for the fine clay (<0.2 µm), coarse clay (0.2–2 µm), silt (2–50 µm), and fine-sand (50–250 µm) fractions from the 2Bt3 horizons. Mg = Mg-saturated; Mg-G = Mg-saturated, glycerol solvated; Mg-F = Mg-saturated, formamide solvated; K-25/300/550 = K-saturated with heating to 25, 300, and 550°C. Samples were pretreated with H₂O₂ to remove organic matter, and citrate-dithionite to remove free Fe oxides before dispersion and particle-size fractionation

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