Corundum is of a greenish white, passing to flesh red, and is crystallized like sapphire. On account of its hardness, it has obtained the name of adamantine spar. It is found in Hindostan, not far from the river Cavery, south of Madras. It occurs also in China, Ceylon, Ava, etc. Of 100 parte, 89 are alumina, 6 silex, 2 oxide of iron, and 3 loss.