zeolite

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zeolite

[′zē·ə‚līt]
(mineralogy)
A group of white or colorless, sometimes red or yellow, hydrous tectosilicate minerals characterized by an aluminosilicate tetrahedral framework, ion-exchangeable large cations, and loosely held water molecules permitting reversible dehydration.
Any mineral of the zeolite group, such as analcime, chabazite, natrolite, and stilbite.

zeolite

A coarse-grained chemical compound used in water-softening equipment; consists of a greenish granular material containing iron (up to 25%), a large percentage of silica, and some alumina and potash.