natrolite

[na-truh-lahyt, ney-]
noun
a white or colorless zeolite mineral, a hydrous silicate of sodium and aluminum, Na 2 Al 2 Si 3 O 1 0 ⋅2H 2 O, often occurring in acicular crystals.

Origin:
1795–1805; natro(n) + -lite

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World English Dictionary
natrolite (ˈnætrəˌlaɪt, ˈneɪ-)
 
n
a colourless, white, or yellow zeolite mineral consisting of sodium aluminium silicate in the form of needle-like orthorhombic crystals. Formula: Na2Al2Si3O10.2H2O
 
[C19: from natron + -lite]

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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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Example sentences
Natrolite is an orthorhombic mineral that forms needles extending from the nucleation site.
Radiation damage was reduced at low temperature in albite but was enhanced in natrolite.
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