sodalite

[sohd-l-ahyt]
noun
a mineral, sodium aluminum silicate, Na 4 Al 3 Si 3 O 1 2 Cl, occurring massive and in crystals, usually blue in color and found in certain alkali-rich igneous rocks.

Origin:
1800–10; soda + -lite

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sodalite (ˈsəʊdəˌlaɪt)
 
n
a blue, grey, yellow, or colourless mineral consisting of sodium aluminium silicate and sodium chloride in cubic crystalline form. It occurs in basic igneous rocks. Formula: Na4Al3Si3O12Cl
 
[C19: from soda + -lite]

Collins English Dictionary - Complete & Unabridged 10th Edition
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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)

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
All previous solid state measurements indicated a solid sodalite phase with an equal molar silicon and aluminum ratio.
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