Purple corundum, or sapphire of amethystine tint, is called Oriental amethyst, but this expression is often applied by jewellers to fine examples of the ordinary amethystine quartz, even when not derived from Eastern sources.
Corundum indeed is abundantly met with in the eastern half of Liberia.
SAPPHIRE, 1 a blue transparent variety of corundum, or native alumina, much valued as a gem-stone.
In emery, magnetite in a granular form is largely associated with the corundum; and in certain kinds of mica magnetite occurs as thin dendritic enclosures.
There are indications of sapphires and other forms of corundum.