Stilbite

n. [ Gr. &unr_; to glitter, shine: cf. F. stilbite. ] (Min.) A common mineral of the zeolite family, a hydrous silicate of alumina and lime, usually occurring in sheaflike aggregations of crystals, also in radiated masses. It is of a white or yellowish color, with pearly luster on the cleavage surface. Called also desmine. [ 1913 Webster ]