Aluminium oxide has an ionic bond.
Ionic bonding is present in aluminium oxide.
Its covalent.
Rubidium oxide has an ionic bond.
Copper(I) oxide has an ionic bond.
Aluminium phosphate has an ionic bond.
Aluminium fluoride has an ionic bond.
ionic bond
It is Aluminium combined with Silicon, and it's bond is covalent.
I can tell you the composition: Oxygen Silicon Magnesium Iron Aluminium Calcium Sodium Potassium Silicon Dioxide Magnesium Oxide Wustite (don't Ask!) Aluminium Oxide Calcium Oxide Sodium Oxide Potassium Oxide
Beryllium oxide
ionic
I can tell you the composition: Oxygen Silicon Magnesium Iron Aluminium Calcium Sodium Potassium Silicon Dioxide Magnesium Oxide Wustite (don't Ask!) Aluminium Oxide Calcium Oxide Sodium Oxide Potassium Oxide