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natrolite Member of the zeolite group of minerals, with the formula Na2Al2Si3O10.2H2O; sp. gr. 2.2; hardness 5.0; white; massive, fibrous, or crystalline; occurs as a secondary mineral infilling cavities in basic volcanic rocks and as an alteration product of nepheline.

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natrolite (Na2Al2Si3O10.2H2O) Hydrated silicate mineral, hydrous sodium aluminium silicate. It has orthorhombic system, needle-like crystals, with radiating nodules or compact fibrous masses. It is colourless or white, glassy and brittle. Hardness 5–5.5; r.d. 2.2. See also zeolite