sodaliteArticle Free Pass sodalite, feldspathoid mineral, a
chloride-containing sodium aluminosilicate that occurs with
leucite and nepheline in such igneous rocks as nepheline
syenite, trachyte, and phonolite. For chemical formula and
detailed physical properties, see feldspathoid (table). The
sodalite group also contains hydroxysodalite (hydroxide
substitutes for chloride), nosean (containing sulfide and
water), and haüynite (containing sulfide and having calcium
partially replacing sodium). Nosean, found as gray, brown, or
blue rounded grains containing inclusions, is a common
constituent of volcanic ejecta. Haüynite (haüyne) varies in
colour from white or gray to green or blue. The blue variety,
lazurite, is the primary constituent of lapis lazuli; its depth
of colour seems to increase with additional sulfide
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