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The structure of zeolite water in single crystals of natural zeolites represented by clinoptilolite Na2K2Ca[Al6Si30O72]·22H2O and heulandite Ca3Mg[Al8Si28O72]·24H2O is studied with 1H NMR. Below 170 K the distribution of H2O over the structural positions is shown to be fixed but different for the two minerals. Above 290 K translational and orientational diffusion of zeolite water molecules is observed...
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