TERMIUM Plus®

The Government of Canada’s terminology and linguistic data bank.

GNEIS [1 record]

Record 1 2005-07-11

English

Subject field(s)
  • Petrography
DEF

A foliated rock formed by regional metamorphism in which bands or lenses of granular materials alternate with bands and lenticles in which minerals having flaky or elongate prismatic habits predominate.

OBS

Generally less than 50% of the minerals [in a gneiss] show preferred parallel orientation.

OBS

Often named for a conspicuous mineral constituent (biotile gneiss; hornblendic gneiss) or for the plutonic or sedimentary rock of origin (syenitic gneiss; conglomerate gneiss).

PHR

Felsic, granitic gneiss.

French

Domaine(s)
  • Pétrographie
DEF

Roche [métamorphique] à grains grossiers contenant feldspath (plagioclases et souvent orthose ou microcline) et quartz avec micas subordonnés (muscovite, biotite), en lits plus ou moins réguliers.

CONT

Les gneiss sont classés à partir de critères minéralogiques (à un ou deux micas, à grenat, à silimanite, etc.), texturaux (oeillés, amygdalaires, lenticulaires, rubanés, etc.) ou génétiques (dérivant de roches magmatiques ou sédimentaires).

PHR

Gneiss felsique, granitique.

Spanish

Campo(s) temático(s)
  • Petrografía
CONT

El neis se compone, como el granito, de cuarzo, feldespatos y minerales pesados [...] en el neis [estos componentes] se presentan en forma de cristales alargados y dispuestos en lechos finos que son alternativamente oscuros (mica) y claros (cuarzo y feldespatos).

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