In general, montmorillonite and other dioctahedral 2:1 layer silicates are characterized by dehydroxylation temperatures between 500–700°C (e.g.,Mackenzie, 1957; Grim and Kulbicki, 1961; Schultz, 1969; Guggenheim, 1990). Differences in dehydroxylation temperature are primarily related to the kind of octahedrally coordinated cations present and their distribution and movement in dioctahedral 2:1 layer silicates (Drits et al., 1995), although the interlayer cation may have an effect also (e.g.,Guggenheim and Koster van Groos, 1992).

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Trans-vacant (tv) smectites and micas are characterized by dehydroxylation temperatures which are 150–200°C lower than those for the...

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