zeolite
noun
ze·o·lite
ˈzē-ə-ˌlīt
: any of various hydrous silicates that are analogous in composition to the feldspars, occur as secondary minerals in cavities of lavas, and can act as ion-exchangers
also
: any of various natural or synthesized silicates of similar structure used especially in water softening and as adsorbents and catalysts
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Merriam-Webster unabridged
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