O-lĭg’o-elāse, n.

n. [Gr. ὀλίγος, few, little, and κλά-σις, fracture, cleaving, fr. κλᾶν, to break or cleave.] (Min.) A mineral of a white color, or white with a shade of yellow, gray, red, or green, consisting chiefly of the silicate of alumina, with a small proportion of the silicate of soda, or the silicate of lime, or both. Dana.