Aluminium oxides

Aluminium oxides or aluminum oxides are a group of inorganic compounds with formulas including aluminium (Al) and oxygen (O).

• Aluminium(I) oxide (Al₂O)
• Aluminium(II) oxide (AlO) (aluminium monoxide)
• Aluminium(III) oxide (aluminium oxide), (Al₂O₃), the most common form of aluminium oxide, occurring on the surface of aluminium and also in crystalline form as corundum, sapphire, and ruby.