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andalusite
[ an-dl-oo-sahyt ]
noun
, Mineralogy.
- an orthorhombic form of aluminum silicate, Al 2 SiO 5 , found in schistose rocks.
andalusite
/ ˌændəˈluːsaɪt /
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
andalusite
/ ăn′də-lo̅o̅′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: Al 2 SiO 5 .
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Word History and Origins
Origin of andalusite1
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Example Sentences
In mica-gneisses sillimanite, kyanite, andalusite and garnet may occur.
From Project Gutenberg
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