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Reference.org
Nepheline
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<p>Nepheline, also called nephelite , is a rock-forming <a href="/facts/Mineral/LkUFbNmv">mineral</a> in the <a href="/facts/Feldspathoid/a2hPbGCg">feldspathoid</a> group – a silica-undersaturated <a href="/facts/Aluminosilicate/3gclsh2j">aluminosilicate</a>, <a href="/facts/Sodium/eYuSPu2V">Na</a>3<a href="/facts/Potassium/FWPwS7Rj">K</a><a href="/facts/Aluminium/7wmR8jYE">Al</a>4<a href="/facts/Silicon/cgWx0hdr">Si</a>4<a href="/facts/Oxygen/acyn6o8r">O</a>16, that occurs in <a href="/facts/Intrusive_rock/Wl6xaY1a">intrusive</a> and <a href="/facts/Volcanic_rock/ID3oPwtM">volcanic rocks</a> with low silica, and in their associated <a href="/facts/Pegmatite/qW5BUXPg">pegmatites</a>. It is used in <a href="/facts/Glass/hezRsAGf">glass</a> and <a href="/facts/Ceramic/9JKudpqX">ceramic</a> manufacturing and other industries, and has been investigated as an ore of <a href="/facts/Aluminium/7wmR8jYE">aluminium</a>. </p>