Often containing a small amount of iron oxide, it often weathers to other minerals like margarite and sillimanite.
This mineral can be synthetically created by the Verneuil process by means of an inverted oxyhydrogen torch. Often containing a small amount of iron oxide, it often weathers to other minerals like margarite and sillimanite. With a hexagonal crystal structure, its common varieties are often used as abrasives in mixtures called emery. FTP, name this aluminum oxide mineral whose varieties include aquamarine, sapphire, and ruby.
This mineral can be synthetically created by the Verneuil process by means of an inverted oxyhydrogen torch.
corundum