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LEIFITE [2 records]

Record 1 2011-04-26

English

Subject field(s)
  • Mineralogy
Universal entry(ies)
Na2(Si,Al,Be)7(O,OH,F)14
formula, see observation
OBS

Chemical formula: Na2(Si,Al,Be)7(O,OH,F)14

French

Domaine(s)
  • Minéralogie
Entrée(s) universelle(s)
Na2(Si,Al,Be)7(O,OH,F)14
formula, see observation
DEF

Minéral (fluosilicate de sodium et d'aluminium) du système cristallin rhomboédrique, incolore, très acide.

OBS

Formule chimique : Na2(Si,Al,Be)7(O,OH,F)14

Spanish

Save record 1

Record 2 2004-05-05

English

Subject field(s)
  • Petrography
DEF

[A] granite ... that [is] characterized by the absence of plagioclase except as a component of perthite ...

CONT

Early hypersolvus granites at Strange Lake contain sodium-rich minerals such as narsarsukite, aenigmatite, astrophyllite, sodic amphibole and pyroxene, elpidite, leifite, and vlasovite...

French

Domaine(s)
  • Pétrographie
CONT

Les «granites hypersolvus» sont des granites alcalins ayant cristallisé à une température supérieure à celle de l'exsolution des cristaux mixtes orthose-albite. En fin de refroidissement l'exsolution se produit et donne des microperthites qui constituent le seul feldspath de la roche. [...] De tels granites appartiennent souvent à des complexes annulaires subvolcaniques. On y trouve des amphiboles sodiques et le quartz est volontiers subidiomorphe.

CONT

Les granites hypersolvus précoces du complexe de Strange Lake contiennent des minéraux riches en sodium tels que la narsarsukite, l'aenigmatite, l'astrophyllite, les amphiboles et pyroxènes sodiques, l'elpidite, la leifite et la vlasovite [...]

Spanish

Save record 2

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