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The dehydration and dehydroxylation of the smectites, beidellite and montmorillonite (dioctahedral) and saponite and laponite (trioctahedral), were investigated by ETA, DTA, TG and Xray diffractions. There are differences between the behaviors of di-and trioetahedral clays which are due to the differences in the ability of the exchangeable cations to migrate into hexagonal holes of the SiO 4 network and due to the fact that the dehydroxylation and reerystallization of dehydroxylated trioctahedral smectites occur simultaneously, whereas there is a temperature gap of about 300~ between the dehydroxylation and the re.crystallization of dioctahedral smectites.

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