Fig. 7. X-ray diffractograms of clay fractions from a) FWB 19 at 2.5 to 2.6 m, the vadose zone, b) FWB 19 at 5.3 to 5.4 m, c) FWB 21 at 5.7 to 5.8 m, and d) FWB24 at 6.7 m in the saturated zone (HIV, hydroxy-interlayered vermiculite; I, illite; K, kaolinite; Q, quartz).