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MALIGNITE [1 record]

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Alphabetical list of terms

Record 1 2004-02-06

English

Subject field(s)
  • Petrography
DEF

A melanocratic nepheline syenite.

OBS

In general, nepheline, pyroxene, and potassium feldspar occur in roughly equal proportions. The potassium feldspar content must exceed 10% or the rock is classified as belonging to the ijolite suite. Both the nepheline and pyroxene content must exceed 10% or the rock would be classified with the syenites. This rock group is transitional between the ijolites and overlaps the syenitic rock group.

French

Domaine(s)
  • Pétrographie
DEF

Syénite néphélinique mélanocrate.

OBS

En général, la néphéline, le pyroxène et le feldspath potassique y sont en proportions à peu près égales. L'abondance de feldspath potassique doit excéder 10 % sinon la roche est classée dans la suite de l'ijolite. L'abondance de néphéline et de pyroxène doit excéder 10 % sinon la roche est classée avec les syénites. Ce groupe de roches est intermédiaire entre les ijolites et le groupe des roches syénitiques et chevauche en partie celui-ci.

Spanish

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