Abstract
The angular variation of ESR lines is used to localize Fe3+ in trioctahedral and dioctahedral smectites : vermiculites, saponites, beidellites, montmorillonites and chlorites. Chlorite exhibits a resonance line at g~2.0 : this line is attributed to Oh sites, created by substitution of Fe3+ for Mg2+ in the brucite sheet. Two important structural results are directly obtained : 1) localization of interfoliar cations on the C3 axis of tetrahedra in vermiculite and saponite ; 2) the space groupe C1m1 of montmorilonite and beidellite.
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