Examples include calcium aluminate, sapphire, and alumina-zirconia. Calcium aluminate (CaAlO 3) is an aluminate ceramic used in refractory cements and shapes, as well as synthetic slag additions for ...

Sapphire Sapphire is a high-purity and high-density, single-crystalline form of aluminum oxide, which may contain chromia ... Ruby is chromium-doped sapphire used in optical filters and laser rods.