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acid activity adsorbed adsorption Al-fraction albite alkaline Amer ammonia ammonium analcime analysis bentonite calcium catalysts cation exchange chabazite Chem chemical clino clinoptil clinoptilolite CN CN composition concentration cristobalite crystals curves decrease dehydration deposits diagenesis edingtonite electron energy equilibrium erionite exchange capacity experimental F.A. Mumpton facies feldspar ferrierite formation formed fraction framework Geol heat heulandite hydration hydrothermal increase investigated ion-exchange isotherms laumontite lites material mesothelioma method molecular sieve molecules montmorillonite mordenite NaOH natrolite natural mordenite natural zeolites Occurrence olite oxygen phase phillipsite pressure Properties and Utilization ptilolite quartz ratio reaction regeneration rhyolitic samples scolecite sedimentary zeolites Si/Al siliceous silver(I soils solution sorbents sorption spectra structure studied surface synthetic Table temperature tetrahedra thermal tion treatment tuffs Utilization of Natural values vibrations volcanic glass X-ray diffraction zeolitic rocks zones