Nephelite
From Wikipedia, the free encyclopedia.

Nephelite, also called nepheline, is a feldspathoid -- a silica-undersaturated aluminosilicate (NaAlSiO₄) which occurs in low-silicon rocks such as essexite, tephrite, syenite and phonolite.

The original article can be found at: http://en.wikipedia.org/wiki/Nephelite.
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