Wavellite

(49), n. (Min.) A mineral, or variety of clay, found in small, compact masses, of the size of a nut, white and opaque, or yellowish and translucent. [Obs.] Cleveland.

(49), n. [From Wavel, the discoverer.] (Min.) A phosphate of alumina, occurring usually in hemispherical concretions, consisting of fine, radiated fibers, and rarely in distinct crystals, secondaries to a rhombic prism. Dana.