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heulandite

[hyoo-luh n-dahyt] /ˈhyu lənˌdaɪt/
noun
1.
a white or transparent, colorless mineral of the zeolite family, hydrous calcium aluminum silicate, CaAl 2 Si 7 O 18 ⋅6H 2 O, occurring in basic volcanic rocks in the form of crystals with a pearly luster.
Origin
1815-1825
1815-25; named after Henry Heuland, 19th-century English mineral collector; see -ite1
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for heulandite

heulandite

/ˈhjuːlənˌdaɪt/
noun
1.
a white, grey, red, or brown zeolite mineral that consists essentially of hydrated calcium aluminium silicate in the form of elongated tabular crystals. Formula: CaAl2Si7O18.6H2O
Word Origin
C19: named after H. Heuland, 19th-century English mineral collector; see -ite1
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Encyclopedia Article for heulandite

hydrated sodium and calcium aluminosilicate mineral in the zeolite family, formulated (Ca,Na)2-3Al3(Al,Si)2Si13O3612H2O. It forms brittle, transparent, coffin-shaped crystals in various shades of white through red, gray, or brown. Heulandite's molecular structure is an open framework containing six-membered rings of silicate tetrahedra (four oxygen atoms arranged at the points of a triangular pyramid around a central silicon atom) joined in parallel planes. This structure and the substitution of aluminum atoms for some of the silicon atoms give the mineral its cation-exchange properties (dissolved sodium, potassium, calcium, and magnesium readily replacing one another in the molecular structure), making it useful in water softeners. Heulandite is found with other zeolite minerals filling cavities in granites, pegmatites, and basalts. Typical occurrences are in Berufjordhur, Ice.; on islands near Bombay; on the Faroe Islands; and in northeastern New Jersey.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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