Aluminum silicate (or aluminium silicate) is a name commonly applied to chemical compounds which are derived from aluminium oxide, Al2O3 and silicon dioxide, SiO2 which may be anhydrous or hydrated, naturally occurring as minerals or synthetic.

Andalusite, kyanite, and sillimanite are the principal aluminium silicate minerals.

[2][3][4] The triple point of the three polymorphs is located at a temperature of 500 °C (932 °F) and a pressure of 0.4 GPa (58,000 psi).

Also called aluminium silicate dihydrate, kaolinite occurs naturally as a mineral.

These fibrous materials can be encountered as loose wool, blanket, felt, paper or boards.