The Nephelite reference article from the English Wikipedia on 24-Apr-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Nephelite

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.

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