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ALKALI SYENITE [1 record]

Record 1 2006-06-01

English

Subject field(s)
  • Petrography
DEF

Syenite in which less than 5% of the plagioclase is more basic than albite.

CONT

Alkalic, or alkali, syenytes are a special group of rocks that are differentiated from other syenites by the fact that they contain a feldspathoid mineral, such as sodalite, leucite, or nepheline. They also contain significantly less quartz than other syenites. Relatively rare on a global scale, one of the best examples of an alkalic syenite can be found at Mont St. Hilaire in Quebec, Canada.

CONT

Two groups of syenites have long been distinguished, the "alkali syenites" and the "alkali-lime syenites", or "orthosyenites".

French

Domaine(s)
  • Pétrographie
CONT

Les roches «exactement saturées en silice» : ce groupe comprend les syénites alcalines [...]

OBS

[...] s'il y a moins de 5 % de plagioclase plus basique que l'albite.

Spanish

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