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Nepheline-syenite

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About Nepheline-syeniteHide

As a Commodity:
A foid-syenite where nepheline is the most abundant foid.

A plutonic rock composed essentially of alkali feldspar and nepheline. It may contain an alkali ferromagnesian mineral, such as an amphibole (riebeckite, arfvedsonite, barkevikite) or a pyroxene (aegirine or aegirine-augite); the intrusive equivalent of phonolite. Sodalite, cancrinite, hauyne, and nosean, in addition to apatite, sphene, and opaque oxides, are common accessories. Rare minerals are also frequent accessories.

Synonyms: foyaite, eleolite syenite, midalkalite

Ref: AGI


Classification of Nepheline-syeniteHide

Foid-syenite is in section 11 of the QAPF diagram.

Sub-divisions of Nepheline-syeniteHide

Mineralogy of Nepheline-syeniteHide

Essential minerals - these are minerals that are required within the classification of this rock:
Feldspar > Alkali FeldsparFeldspar Group minerals rich in Potassium or Sodium.
Feldspathoid > NephelineNa3K(Al4Si4O16)
Non-essential minerals - these minerals are common, sometimes major components, but are not always present:
Amphibole > HornblendeAn informal name for dark green to black amphiboles, mostly ferro-hornblende or ...
Mica > BiotiteA series or subgroup of the Mica Group.

Synonyms of Nepheline-syeniteHide

References for Nepheline-syeniteHide

Reference List:
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A.G.I. & A.G.I. Supp. = American Geological Institute. Glossary of Geology and Related Sciences. Washington, DC., 1957m 325 pp; supplement, 1960, 72 pp.

Internet Links for Nepheline-syeniteHide

Mineral and/or Locality  
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