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IJOLITA [1 record]

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Alphabetical list of terms

Record 1 2010-11-23

English

Subject field(s)
  • Petrography
DEF

A nepheline-pyroxene rock with a nepheline content between 30 to 70%.

OBS

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

French

Domaine(s)
  • Pétrographie
DEF

Roche pauvre en silice, riche en éléments ferro-magnésiens et en alcalis [...] caractérisée par la coexistence d'un feldspathoïde (normalement néphéline), et d'un élément ferromagnésien (normalement pyroxène) sans feldspath.

CONT

L'ijolite est une roche grenue formée de néphéline et de pyroxènes (augite, aegyrine). La faible teneur en silice (moins de 45 %) explique la disparition complète des feldspaths. Les seuls éléments blancs sont les feldspathoïdes.

OBS

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

Spanish

Campo(s) temático(s)
  • Petrografía
DEF

Roca endógena granuda cuyos principales componentes son la nefelina y la egirina.

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