Natural zeolites, microporous aluminosilicates formed in volcanic sedimentary deposits, feature cage-like structures that selectively adsorb cations like ammonium and heavy metals with ion exchange capacities up to 2.5 meq/g. Mordenite and clinoptilolite varieties crush to 1-5 mm granules for water softening, replacing 30% salt in regenerable filters. Their thermal stability above 600°C...
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