Andalusite



an orthorhombic form of aluminum silicate, Al 2 SiO 5 , found in schistose rocks.
Historical Examples

In mica-gneisses sillimanite, kyanite, andalusite and garnet may occur.
Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 2 Various

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: Al2SiO5
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.

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