Aluminosilicates

Second most abundant minerals (after silicates)

Silica: SiO₂

Alumina: Al₂O₃

Kyanite: Al₂O₃·SiO₂ or Al₂SiO₅

Oxide Formula vs Empirical Formula

Muscovite: KAl₃Si₃O₁₀(OH)₂

Granite

Clay