Abstract
1. The irreversible changes in the crystal structure of stilbite and its cation-exchanged forms on thermal treatment depends not only on the degree of their dehydration but also, to a considerable extent, on the partial pressure of the water vapor above the sample of zeolite. 2. The structure of the new phase formed on heating depends primarily on the type of cations present in the composition of the initial crystal lattice. The Na form of stilbite has considerable differences from the Ca and Zn forms. The number of cations included in the composition of the crystal lattice possibly plays a part. 3. The Si/Al ratio does not affect the behavior of stilbite on thermal treatment. 4. By thermal treatment, the Na form of stilbite can be converted into a form structurally identical with barrerite C-Na-stilbite n. The thermal stability of the latter enables it to be dehydrated completely without structural changes.
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