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andalusite

[an-dl-oo-sahyt]
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noun Mineralogy.
  1. an orthorhombic form of aluminum silicate, Al2SiO5, found in schistose rocks.
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Origin of andalusite

1830–40; named after Andalusia, where it was first found; see -ite1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for andalusite

Historical Examples

  • In mica-gneisses sillimanite, kyanite, andalusite and garnet may occur.

    Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 2

    Various


British Dictionary definitions for andalusite

andalusite

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: Al 2 SiO 5
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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

andalusite in Science

andalusite

[ăn′də-lōōsīt′]
  1. 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.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.