Definitions for: Heulandite

[n] a group of minerals of the zeolite family consisting of a hydrous aluminum silicate of sodium and calcium

Webster (1913) Definition: Heu"land*ite, n. [After Heuland, an English
mineralogist.] (Min.)
A mineral of the Zeolite family, often occurring in
amygdaloid, in foliated masses, and also in monoclinic
crystals with pearly luster on the cleavage face. It is a
hydrous silicate of alumina and lime.

See Also: zeolite