TERMIUM Plus®

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ELEOLITE SYENITE [1 record]

Record 1 2007-10-23

English

Subject field(s)
  • Petrography
DEF

A plutonic rock composed essentially of alkali feldspar and nepheline.

CONT

Nepheline syenites may be associated with alkali syenites, with other feldspathoidal rocks, or with some alkali granites.

OBS

[This rock] may contain an alkali ferromagnesian mineral, e.g. an amphibole ... or a pyroxene ...; the intrusive equivalent of phonolite.

OBS

eleolite syenite: An obsolescent synonym of nepheline syenite, especially of a coarse-grained variety containing eleolite.

OBS

nepheline syenite: term used at Natural Resources Canada - Earth Sciences Sector.

French

Domaine(s)
  • Pétrographie
DEF

Roche plutonique grenue caractérisée par la coexistence d'un feldspath alcalin le plus souvent sodique (albite) ou sodipotassique (anorthose ou cryptoperthite), d'un feldspathoïde (néphéline, éventuellement sodalite, aralcime, noséane), également sodique, et d'un élément ferromagnésien [...]

OBS

[Ne comporte] pas d'orthopyroxène. Minéraux accessoires : apatite, sphène, zircon.

OBS

syénite néphélinique : terme en usage à Ressources naturelles Canada - Secteur des sciences de la Terre.

Spanish

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