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natrolite

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nat⋅ro⋅lite

  [na-truh-lahyt, ney-]
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–noun
a white or colorless zeolite mineral, a hydrous silicate of sodium and aluminum, Na2Al2Si3O1 0·2H2O, often occurring in acicular crystals.
Origin:
1795–1805; natro(n) + -lite
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Based on the Random House Dictionary, © Random House, Inc. 2009.
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na·tro·lite   (nā'trə-līt')   
n.  A mineral in the zeolite family with composition Na2Al2Si3O10·2H2O.

[natro(n) + -lite.]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Encyclopedia

natrolite

hydrated sodium aluminosilicate mineral, Na2Al2Si3O102H2O, in the zeolite family. It has been found in the form of colourless or white, glassy, slender crystals or fibrous masses filling cavities or fissures in basaltic rocks, as in Trentino, Italy; Brevik, Nor.; Belfast, N.Ire.; the Faroe Islands; and northeastern New Jersey, U.S. Natrolite was one of the first zeolite minerals for which cation-exchange properties (dissolved sodium, potassium, calcium, and magnesium readily replacing one another in the molecular structure) were discovered. It is used in softening water.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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