{ Neph"e*line (?), Neph"e*lite (?) }, n. [gr. &?; cloud: cf. F. néphéline. Cf. Nebula.] (Min.) A mineral occuring at Vesuvius, in glassy hexagonal crystals; also elsewhere, in grayish or greenish masses having a greasy luster, as the variety elæolite. It is a silicate of aluminia, soda, and potash.