zeolites

<chemical> Zeolites. A group of crystalline, hydrated alkali-aluminum silicates. They occur naturally in sedimentary and volcanic rocks, altered basalts, ores, and clay deposits. Some 40 known zeolite minerals and a great number of synthetic zeolites are available commercially. ... Chemical name: Zeolites ... (12 Dec 1998) ...
Found on http://www.encyclo.co.uk/local/20973

Zeolites

Zeolites are a group of complex silicate minerals mostly occurring in cavities in basic volcanic rocks. They are usually colourless or white and are relatively soft. Formerly used as water softeners, they are used as molecular sieves in the petroleum industry and as drying agents.
Found on http://www.probertencyclopaedia.com/browse/HZ.HTM
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