Aluminosilicate
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aluminosilicate
(ə¦lüm·ə′nō¦sil·ə′kāt)
(inorganic chemistry) 3Al2O3·2SiO2 A colorless, crystalline combination of silicate and aluminate in the form of rhombic crystals.
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Aluminosilicate
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Phase diagram of the Aluminosilicates.[1]
Aluminosilicate minerals are minerals composed of aluminium, silicon, and oxygen, plus countercations. They are a major component of kaolin and other clay minerals.
Andalusite, kyanite, and sillimanite are naturally occurring aluminosilicate minerals that have the composition Al2SiO5.[2][3][4] The triple point of the three polymorphs is located at a temperature of 500 °C and a pressure of 0.4 GPa. These three minerals are commonly used as index minerals in metamorphic rocks.
Hydrated aluminosilicate minerals are referred to as zeolites and are porous structures that are naturally occurring materials.
The catalyst silica-alumina is an amorphous substance which is not an aluminosilicate compound.
See also
References
- ^ Whitney, D.L. (2002), "Coexisting andalusite, kyanite, and sillimanite: Sequential formation of three Al2SiO5 polymorphs during progressive metamorphism near the triple point, Sivrihisar, Turkey", American Mineralogist 87 (4): 405–416, http://ammin.geoscienceworld.org/cgi/content/abstract/87/4/405
- ^ Andalusite, Handbook of Mineralogy
- ^ Kyanite, Handbook of Mineralogy
- ^ Sillimanite, Handbook of Mineralogy
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