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andalusite

[an-dl-oo-sahyt] /ˌæn dlˈu saɪt/
noun, Mineralogy
1.
an orthorhombic form of aluminum silicate, Al 2 SiO 5 , found in schistose rocks.
Origin
1830-1840
1830-40; named after Andalusia, where it was first found; see -ite1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for andalusite
  • Rare minerals such as garnets, sillimanite, staurolite or andalusite can be common in places.
British Dictionary definitions for andalusite

andalusite

/ˌændəˈluːsaɪt/
noun
1.
a grey, pink, or brown hard mineral consisting of aluminium silicate in orthorhombic crystalline form. It occurs in metamorphic rocks and is used as a refractory and as a gemstone. Formula: Al2SiO5
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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andalusite in Science
andalusite
  (ān'də-l'sīt')   
A hard, grayish white to pinkish brown orthorhombic mineral. Andalusite occurs as nearly square prisms, often with cross-shaped cross sections, in metamorphic rocks. It is a polymorph of kyanite and sillimanite, but forms at shallower depths than they do, and at higher temperatures than kyanite and lower temperatures than sillimanite. Chemical formula: Al2SiO5.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Article for andalusite

(Al2SiO5), aluminum silicate mineral that occurs in relatively small amounts in various metamorphic rocks, particularly in altered sediments. It is found in commercial quantities in the Inyo Mountains, Mono county, Calif., in the United States; in Kazakhstan; and in South Africa. Such deposits are mined as a raw material for refractories and porcelain used in spark plugs and other products. For detailed physical properties, see silicate mineral (table 2)

Learn more about andalusite with a free trial on Britannica.com
Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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