Definition of "natrolite" [na•tro•lite]

• A mineral in the zeolite family with composition Na2Al2Si3O10·2H2O. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "They form a large class of minerals of which Thomsonite and natrolite may be selected as examples --"
• "The bed holding the upright crystals is also natrolite in confused matted masses."
• "It generally occurs in the form shown in Fig. 9, grouped very similarly to natrolite, and being right upon the rock or a thin bed of itself."