Heulandite
Pronunciation : Heu"land*ite
Part of Speech : n.
Etymology : [After Heuland, an English mineralogist.] (Min.)
Definition : Defn: 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.
Source : Webster's Unabridged Dictionary, 1913