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Abstract.The water tracer diffusion in single crystals of natrolite, scolecite, mesolite, heulandite, and chabazite has been studied by Raman micro-spectroscopy. A model of water tracer diffusion is proposed. The H20, HDO, and D20 molecule concentrations are calculated for a crystal of orthorhombic symmetry on deuteration of the initial H20-sample. A way is shown to find the diffusion coefficients, the constant of equilibrium, and the deuteron-proton exchange rate from experimental data.The water diffusion coefficients for natrolite placed in liquid D20 appeared to be 1.5-2 times higher than those for a sample in vaporous D20. For natrolite at room temperature, 1.5-1.6 times higher water diffusion occurs along [001] than along [110].