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glauconite

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Glauconite: Value
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glau⋅co⋅nite

  [glaw-kuh-nahyt]
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–noun
a greenish micaceous mineral consisting essentially of a hydrous silicate of potassium, aluminum, and iron and occurring in greensand, clays, etc.
Origin:
1830–40; < Gk glaukón, neut. of glaukós (see glauco- ) + -ite 1

Related forms:
glau⋅co⋅nit⋅ic  [glaw-kuh-nit-ik] , adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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Glauconite: Value
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glau·co·nite   (glô'kə-nīt')   
n.  A greenish mineral of the mica group, a hydrous silicate of potassium, iron, aluminum, or magnesium, (K,Na)(Al,Fe,Mg)2(Al,Si)4O10(OH)2, found in greensand and used as a fertilizer and water softener.

[German Glaukonit : Greek glaukon, neuter of glaukos, gray + -ite1.]
glau'co·nit'ic (-nĭt'ĭk) adj.
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

glauconite

greenish ferric-iron silicate mineral with micaceous structure [(K, Na)(Fe3+,Al, Mg)2(Si, Al)4O10(OmicronH)2], characteristically formed on submarine elevations ranging in depth from 30 to 1,000 metres (100 to 3,300 feet) below sea level. Glauconite is abundant only in sea-floor areas that are isolated from large supplies of land-derived sediment.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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