By Wilfrid Dunwell

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Are present in pyrophyllite domains of illite structure. Such "structural" water molecules have been identified by IR absorption bands at 3420 and 3260 cm- l (Besson and Drits 1997a_b). As their is no evidence of any increase in the dool -spacing, it is probable that these water molecules are present in the pyrpyr sites and reduce the structural strain between the pyrophyllite and mica domains. The thermochemical considerations lead us to the conclusion that illite is in fact a stable, individual phase, distinct from aluminous micas and distinct from I/S MLMs of high illite content.

Illite seems to contain more water than micas do. Norrish and Pickering (1983) showed 21 Definition Based on Chemical Composition muscovite octahedral charge pyrophyllite Fig. 10. The three-component chemiographic system muscovite - celadonite - pyrophyllite defined with data points from Hower and Mowatt (1966) that H20 contents are inversely related to K20 in illites which apparently do not contain any smectite layers. Even if the presence ofH30+ cations replacing K+ in the interlayers is still controversial, it remains a fact that the DTA curves of illites are different from those of micas.

A small fraction of the CEC of illites is known to be selective for cations having a low hydration energy such as Cs, Rb or K. The sorption of cesium ions has been intensively studied because of analogies with radioactive elements (Kim et al. 1996; Poinssot et al. 1999; Kulik et al. Three different sites have been identified: (Maes et al. 3 percent of the CEC), - type c: low-selectivity sites which are located on the outer basal surfaces (96 to 97 percent of the CEC). The type a sites were considered to result from the opening of the mica interlayer zones due to partial removal of K+ ions during weathering (so-called "frayed" sites).

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