THE 5-SECOND TRICK FOR ALUMINUM OXIDE

The most typical form of crystalline alumina, α-aluminium oxide, is recognized as corundum. When trace elements ensure it is appear red it is known as ruby, but all other colorations drop under the designation sapphire. Corundum includes a trigonal Bravais lattice with an area group of R-3c (amount 167 within the International Tables).Cerium Oxide