noun Mineralogy.
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.

1770–80; < Greek ze(în) to boil + -o- + -lite

zeolitic [zee-uh-lit-ik] , adjective
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World English Dictionary
zeolite (ˈziːəˌlaɪt)
1.  any of a large group of glassy secondary minerals consisting of hydrated aluminium silicates of calcium, sodium, or potassium: formed in cavities in lava flows and plutonic rocks
2.  See molecular sieve any of a class of similar synthetic materials used in ion exchange and as selective absorbents
[c18: zeo-, from Greek zein to boil + -lite; from the swelling up that occurs under the blowpipe]

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American Heritage
Science Dictionary
zeolite   (zē'ə-līt')  Pronunciation Key 
Any of a family of hydrous aluminum silicate minerals, whose molecules enclose cations of sodium, potassium, calcium, strontium, or barium. Zeolites are usually white or colorless, but they can also be red or yellow. They are characterized by their easy and reversible loss of water of hydration. They usually occur within cavities in basalt.
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Example sentences
The sponge sucks in water molecules, which are small and can fit in the zeolite's cavities.
Something about zeolite deposits being visible in some scenes.
He relates how geologists spotted zeolite into scenery and called the movie directory to find where it was shot.
The new catalyst uses zeolite as a base material, which is coated with precious metals.
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