I'o-lite, n.

n. [Fr. iolithe, from Gr. ἴον, a violet, and λίθος, stone.] (Min.) A mineral having a glassy appearance, remarkable for presenting a blue or violet-blue color in one direction, and, at right angles with this direction, a yellowish-gray or brownish color. It consists of silica, alumina, and magnesia, with some oxide of iron;—called also dichroite.