English: Hydroxide of alumina; Oxide of aluminum; Pure clay.
Alumina is the most well known
Aluminium compound in homeopathy.
SignatureAlumina is another word for aluminium oxide, or Al2O3. It is the main component of ordinary clay. As a gemstone it is called corundum, sapphire or ruby, depending on its colour. The red ruby derives its colour from the nickel component.