TERMIUM Plus®

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NA(SI3ALO8) [1 record]

Record 1 2011-05-06

English

Subject field(s)
  • Mineralogy
Universal entry(ies)
DEF

A colorless or milky-white triclinic mineral belonging to the feldspar group and corresponding to the Na-rich end member of the alkalic feldspars.

OBS

albite: Named from the Latin Albus, white, the common color of the mineral.

OBS

Chemical formula: NaAlSi3O8 or Na(Si3 AlO8)

French

Domaine(s)
  • Minéralogie
Entrée(s) universelle(s)
DEF

Minéral du système triclinique correspondant au terme sodique des feldspaths alcalins et se présentant sous forme de cristaux blanc laiteux ou incolores.

CONT

L'albite et les autres plagioclases sont souvent associés en des macles multiples ou polysynthétiques [...]. L'albite, le plus sodique, tire son nom de sa teinte blanche qui s'oppose aux teintes crème ou rose des feldspaths potassiques [...] éclat vitreux : n = 1,53. d = 6,5 [...]

OBS

Étymologie : du latin albus, «blanc».

OBS

Formule chimique : Na(Si3AlO8) ou NaAlSi3O8

Spanish

Campo(s) temático(s)
  • Mineralogía
Entrada(s) universal(es)
DEF

Plagioclasa sódica de la serie de las plagioclasas. Cristaliza en el sistema triclínico. Incoloro o blanco, de brillo vítreo, ligero y duro.

CONT

La albita forma masas laminares exfoliables o bien cristales que son generalmente translúcidos o transparentes, aunque también los hay opacos; esos cristales, cuya simetría es triclínica, se presentan con frecuencia en forma de maclas; al ser fundidos dan un vidrio que es inatacable por los ácidos.

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