Aluminium Oksaydh (Al2O3)waa walax crystalline ah oo cad ama ku dhawaad midab lahayn, iyo iskudhis kiimiko ah oo aluminium iyo ogsijiin ah. Waxay ka samaysan tahay bauxite oo caadi ahaan loo yaqaan alumina waxaana sidoo kale lagu magacaabi karaa aloxide, aloxite, ama alundum taas oo ku xidhan foomamka ama codsiyada gaarka ah. Al2O3 waxay muhiim u tahay adeegsigeeda si loo soo saaro birta aluminiumka, sida abrasive ay ugu wacan tahay engegnaanteeda, iyo walxo dib u celin ah oo ay ugu wacan tahay barta dhalaalkeeda sare.