(or aluminum silicate
) has the chemical formula Al2
. 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.
Minerals composed of aluminium silicate include
These all have the same chemical composition but are polymorphic, having different crystalline structures.
Aluminium Silicate is fireproof.