Dictionary
ze•o•lite
Pronunciation: (zē'u-līt"), [key]—
n. Mineral.
any of a group of hydrated silicates of aluminum with alkali metals, commonly occurring as secondary minerals in cavities in basic volcanic rocks: used for their molecular sieve properties because they undergo dehydration with little or no change in crystal structure.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.