“…Substitution of Li in the interlayers led to partial oxidation of Fe 2+, as previously reported (Rozenson and Heller-Kallai, 1978), but did not affect the M6ssbauer spectra of either the unheated or the heated material. The sample, however, differed from natural (largely Na-substituted) montmorillonite in several other respects: the OH bending vibrations were modified, as described by Calvet and Prost (1971), who attributed the changes to partial penetration of Li into the octahedral sheets, h20 decreased, as for natural montmorillonite, but the final value was reached at a considerably lower temperature.…”