The Collaborative International Dictionary of English v.0.48:

Stilbite \Stil"bite\, n. [Gr. ? 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]