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PERTHITE [1 record]

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Alphabetical list of terms

Record 1 2016-02-04

English

Subject field(s)
  • Mineralogy
DEF

A variety of alkali feldspar consisting of intergrowths in which the potassium-rich phase (usually microcline) appears to be the host from which the sodium-rich phase (usually albite) exsolved.

OBS

The exsolved areas typically form strings, lamellae, blebs, films, or irregular veinlets.

French

Domaine(s)
  • Minéralogie
DEF

Variété de feldspath orthose.

CONT

[...] à basse température, il y a immiscibilité entre les termes extrêmes (les ions K et Na ont des rayons ioniques qui diffèrent de plus de 15 %) et le milieu qui possède, par exemple, une composition de 60Or40Ab se consolide en un cristal hétérogène, appelé perthite [...]

OBS

[...] les feldspaths mixtes Na-K nommés perthites ou antiperthites sont des associations à l'échelle minérale, non à l'échelle ionique.

Spanish

Campo(s) temático(s)
  • Mineralogía
DEF

Variedad de albita asociada con la ortosa [que] se encuentra en forma de cordones de granos gruesos.

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