On the Varieties of Heulandite

As the results obtained from x-ray diffraction at the elevated temperatures, fluorescent x-ray analyses and infrared absorption concerning some specimens of zeolite with the ordinary patterns of heuland-ite in case of no treatments and with the similar values for Al : Si ratio in the framework structure construct-ed mainly of Al and Si atoms, though more or less different in the content of alkali and alkaline earth metals, have become considerably clear the transformation of heulandite merely through dehydration as well as the thermal stability of its structure, the effects of mingling of heulandite with clinoptilolite, the presence of four- and six-coordinated Al and difference in the wave number and intensity of infrared absorption.