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HORNBLENDIC GNEISS [2 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

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).

Save record 1

Record 2 1999-04-27

English

Subject field(s)
  • Geology
  • Mineralogy
DEF

A coarse-grained metamorphic rock containing hornblende as the dominant colored constituent, together with feldspar and quartz, the texture being typical of the gneisses. [It differs] from hornblende schist in grain size and texture only.

French

Domaine(s)
  • Géologie
  • Minéralogie
CONT

Il est à remarquer que les gneiss à hornblende sont souvent très pauvres en quartz; leur feldspath est un plagioclase calcosodique [...]

Spanish

Save record 2

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