Heü'land-ite, n.

n. [So called by Brooke, from Mr. Heuland, an English mineralogist.] (Min.) A mineral of the zeolite family, occurring in amygdaloid, in pearly, foliated masses, and also crystallized in rhomboidal prisms, with the basal plane pearly. It consists of silica, alumina, and lime, with about fifteen per cent. of water.