Composition: Sodium aluminum silicate chloride
Nomenclature: Named after it's chemical composition, sodium (sod) and aluminum (al).
Industrial Uses: Ornamental stone; jewelry.
Additional Notes: A member of the feldspathoid group of minerals. Feldspathoids are chemically similar to alkali feldspars, but have a low silica content.
Canada : Scott 1437 : 42 cents : 21 Sep 1992