natrolite

views updated May 08 2018

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.

natrolite

views updated May 14 2018

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

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