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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