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andalusite

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an·da·lu·site  (nd-lst)
n.
A mineral, aluminum silicate (Al2SiO5), usually found in orthorhombic crystals of various colors.
[After Andalusia.]
andalusite [ˌændəˈluːsaɪt]
n
(Earth Sciences / Minerals) 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  (nd-lst)
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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