a whitish mineral consisting of sodium aluminum silicate or potassium aluminum silicate in crystalline form; used in the manufacture of ceramics and enamels
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Examples of nepheline
nepheline
It also occurs in low silica igneoussyenite and nepheline syeniteintrusives.
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Nepheline, likewise, is usually found in rocks with much soda and comparatively little silica.
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The same distinction holds for nepheline varieties.
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Rocks that contain leucite or nepheline, either partly or wholly replacing felspar, are not included in this table.
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Formulations were later developed based on kaolin clay with quartz, feldspars, nepheline syenite or other feldspathic rocks.
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Minerals such as alkali feldspar, leucite, nepheline, sodalite, phlogopite mica, and apatite may be present in the groundmass.
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Phosphate deposits are also formed from alkaline igneous rocks such as nepheline syenites, carbonatites and associated rock types.
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Historically it was mined from deposits associated with dunites in North Carolina, USA and from a nepheline syenite in Craigmont, Ontario.
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The latter two are dark green minerals, which occur as original constituents of igneous rocks rich in sodium, such as nepheline-syenite and phonolite.
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- A whitish mineral consisting of sodium aluminum silicate or potassium aluminum silicate in crystalline form; used in the manufacture of ceramics and enamels
- Nepheline, also called nephelite (from Greek: u03BDu03B5u03C6u03ADu03BBu03B7, "cloud"), is a feldspathoid: a silica-undersaturated aluminosilicate, Na3KAl4Si4O16, that occurs in intrusive and volcanic rocks with low silica, and in their associated pegmatites.
- A feldspathoid mineral of silica-poor igneous, plutonic and volcanic rocks. Chemically, Nepheline is a plagioclase feldspar with insufficient silica to satisfy the chemical bonds. Because of the unfilled bonds, Nepheline weathers rapidly and can only be seen as inclusions in freshly broken rock
- (Na, K)(Al, Si)2O4; colorless to turbid in thin section; may have rows of inclusions; short prismatic hexagonal crystals w/ hexagonal & rectangular sections; low relief; low birefringence; alters readily to zeolites, etc. ...
