sodalite

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sodalite

[′sōd·əl‚īt]
(mineralogy)
Na2 Al3Si3O12Cl A blue or sometimes white, gray, or green mineral tectosilicate of the feldspathoid group, crystallizing in the isometric system, with vitreous luster, hardness of 5 on Mohs scale, and specific gravity of 2.2-2.4; used as an ornamental stone.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.