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Presents a study that examined the dehydration of strontium-exchanged heulandite using single-crystal x-ray diffraction. Analysis of the movement of strontium cations within the channels with increasing temperature; Description of the framework topology at all dehydration states; Comparison of the result with the findings of other studies.

Presents a study which made calorimetric measurements on samples of heulandite. Occurrence of calcium-rich high-silica zeolites, heulandite and stilbite; Characterization of zeolite; Discussion.

Presents information on a study on the optical properties of natural and cation-exchanged heulandite group zeolites from Nasik, India. Heulandite optics; Experimental methods; Results and discussion; Conclusion.

Presents a study into the incorporation of rare-earth elements particularly lanthanum and erbium into heulandite and the possible interactions of the zeolite with acidic aqueous solutions. Experimental methods; Results and discussion; Conclusion.

Examines results of cation-exchange experiments conducted on three geographically distributed heulandite-group zeolite samples. Observation of diffusion gradients for two of the three samples; Effect of structural refinements on exchanged and non-exchanged samples from Poona, India; Birefringence variation measurements.