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cordierite

[kawr-dee-uh-rahyt] /ˈkɔr di əˌraɪt/
noun
1.
a strongly dichroic blue mineral consisting of a silicate of magnesium, aluminum, and iron: common in metamorphic rocks.
Also called dichroite, iolite.
Origin of cordierite
1805-1815
1805-15; named after Pierre L. A. Cordier (1777-1861), French geologist; see -ite1
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Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for cordierite

cordierite

/ˈkɔːdɪəˌraɪt/
noun
1.
a grey or violet-blue dichroic mineral that consists of magnesium aluminium iron silicate in orthorhombic crystalline form and is found in metamorphic rocks. Formula: (Mg,Fe)2AL4Si5O18.nH2O Also called dichroite, iolite
Word Origin
C19: named after Pierre L. A. Cordier (1777–1861), French geologist who described it
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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cordierite in Science
cordierite
  (kôr'dē-ə-rīt')   
A light-blue to dark-blue or gray orthorhombic mineral. Cordierite is a silicate of magnesium, aluminum, and sometimes iron, and is found in granites and in metamorphic rocks that form under relatively low-pressure conditions. Chemical formula: (Mg,Fe)2Al4Si5O18.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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