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QUARTZ FELSITE [1 record]

Record 1 2016-02-04

English

Subject field(s)
  • Petrography
DEF

A porphyritic extrusive or hypabyssal rock containing quartz and alkali feldspar phenocrysts embedded in a microcrystalline or cryptocrystalline matrix.

CONT

Felsite. ... The mass of the rock consists of a fine-grained matrix of felsic materials, particularly quartz, sodium and potassium feldspar, and may be termed a quartz felsite or quartz porphyry if the quartz phenocrysts are present.

OBS

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

French

Domaine(s)
  • Pétrographie
OBS

C'est une roche effusive de composition analogue au granite, mais présentant une structure différente : les cristaux de quartz (automorphes) et de feldspath sont noyés dans une mésostase uniforme, compacte, souvent colorée de rouge ou de gris (structure porphyrique).

OBS

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

Spanish

Campo(s) temático(s)
  • Petrografía
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