Alumino-silicate

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. 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.

There exist a wide variety of glass types. The characteristics of these different types depend on the chemical composition of the glass with a special focus on the oxide composition. Glasses can be categorized into many different groups, one of them including the so-called aluminosilicate glasses.

The maximum allowable temperatures of aluminosilicate glasses of up to 800 °C are far above those of borosilicate glasses and reach the level of glass cermic materials. The relevant property to decide about maximum temperatures for glasses is the transformation temperature. The thermal expansion of this glass family can be adjusted to common electrod materials such as molybdenum. A matched thermal expansion allows for a extremely tight and gas-proof glas to metal seal which is achieved by hot forming.

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