Aluminium silicate

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Aluminium silicate (or aluminum silicate) has the chemical formula Al₂SiO₅. It has a density of 2.8 to 2.9 g/cm³, a vitreous lustre, a refractive index of 1.56, a Mohs hardness of 1-2, and an orthorhombic crystallography.^[1]

Minerals composed of aluminium silicate include:

• Andalusite
• Sillimanite (also called Bucholzite)
• Kyanite

These all have the same chemical composition but are polymorphic, having different crystalline structures.

[edit] References

1. ^ Reade Advanced Materials offers: Aluminum Silicate Powder. Retrieved on November 16, 2006.