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From The Collaborative International Dictionary of English v.0.48:
Natrolite \Na"tro*lite\ (?; 277), n. [Natron + -lite: cf. F. natrolithe.] (Min.) 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. [1913 Webster]