Fig. 7 X-ray diffraction diagrams from sorted biotite and related clay minerals pseudomorphs. (A) M4 saprolite. Slightly weathered biotite; (B) M2 nonsaprolite residuum. Transparent biotite mica flakes; (C) M4 Typic Hapludult Bt horizon. Pseudomorphs after biotite; (D) M2 saprolite. Clayey white volume (same material as Fig. 5, Photo 4, and Fig. 6b). Q = quartz, M = mica, K = kaolinite, G = gibbsite, Go = goethite. Peak values in angströms

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