A: Aluminum silicate refers to compounds gotten from both aluminum oxide and silicon dioxide. It features good thermal shock resistance and easily replaces carbon fixtures in many applications. There are various types of aluminum silicate, and these compounds could come in a natural or synthetic form. Natural minerals of aluminum silicate have a common chemical formula-Al2SiO5.

A： Kyanite - This form of aluminum silicate is often found in metamorphic and sedimentary rocks. It is also referred to as disthene or cyanite. Kyanite is more stable at high pressure than the other aluminum silicate minerals. The strength of kyanite is highly dependent on its direction. For instance, it shows more strength perpendicular to an axis and shows less strength parallel to the same axis. For this reason, it is described as anisotropic. Andalusite – This form of aluminum silicate is usually found in metamorphic rocks. It is named after a community in Spain known as Andalusia. Like other aluminum silicate minerals, its chemical formula is Al2SiO5. It has an orthorhombic crystal lattice. Sillimanite - This tough aluminum silicate compound derived its name from an American chemist called Benjamin Silliman. It is usually stable under high temperatures. Sillimanite is usually gotten from sedimentary rocks. Sillimanite has an orthorhombic crystal system.

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A: - Al2SiO5, (Al2O3?SiO2), which occurs naturally as the minerals andalusite, kyanite and sillimanite which have different crystal structures. - Al2Si2O5(OH)4, (Al2O3?2SiO2?2H2O), which occurs naturally as the mineral kaolinite and is also called aluminium silicate dihydrate. It is a fine white powder and is used as a filler in paper and rubber and also used in paints. - Al2Si2O7, (Al2O3?2SiO2), called metakaolinite, formed from kaolin by heating at 450 °C (842 °F).[2] - Al6Si2O13, (3Al2O3?2SiO2), the mineral mullite, the only thermodynamically stable intermediate phase in the Al2O3-SiO2 system at atmospheric pressure.[3] This also called '3:2 mullite' to distinguish it from 2Al2O3?SiO2, Al4SiO8 '2:1 mullite'. - 2Al2O3?SiO2, Al4SiO8 '2:1 mullite'.

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