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ALUMINUM SILICATE (Andalusite), kyanite, and sillimanite are three polymorphs minerals that belong to the nesosilicate minerals. Hence they have the same chemical formula [Al₂SiO₅ = Al₂O₃·SiO₂] and all contain theoretically 62.92 wt.% Al₂O₃ and 37.08 wt.% SiO₂. Andalusite decomposes gradually from 1380 to1400°C with a low volume increase of 5 to 6 vol.%.

Montmorillonite (Aluminum Pillared Clay) can be used to prepare poly(methyl methacrylate) (PMMA) based nanocomposite materials.