Natrolite
Pronunciation : Na"tro*lite
Part of Speech : n.
Etymology : [Natron + -lite: cf. F. natrolithe.] (Min.)
Definition : Defn: A zeolite occuring in groups of glassy acicular crystals, and in masses which often have a radiated structure. It is a hydrous silicate of alumina and soda.
Source : Webster's Unabridged Dictionary, 1913