andalusite

[an-dl-oo-sahyt]

noun Mineralogy.

an orthorhombic form of aluminum silicate, Al2SiO5, found in schistose rocks.

Origin of andalusite

1830–40; named after Andalusia, where it was first found; see -ite¹

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Examples from the Web for andalusite

Historical Examples of andalusite

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

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

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-lōō′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.