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MONALBITE [2 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2012-02-07

English

Subject field(s)
  • Mineralogy
  • Geochemistry
DEF

A feldspar rich in alkali metals (as potassium and/or sodium) but poor in calcium.

CONT

Alkali feldspars is the name for feldspars composed of Or and Ab in any ratio. Usually some An is present as a minor constituent. The amount of An that can be taken up by the alkali feldspars increases with the Ab/Or ratio.... There are many names for the different varieties of alkali feldspars, most of which are listed... below. Sanidine.... Microcline.... Orthoclase.... Albite.... Monalbite.... Analbite.... Perthite and antiperthite.... Anorthoclase.

French

Domaine(s)
  • Minéralogie
  • Géochimie
CONT

Feldspaths alcalins. Ce sont les feldspaths constitués par l'orthose et l'albite en toutes proportions; en général, ils peuvent également contenir, comme constituant mineur, de petites quantités d'anorthite qui augmentent en même temps que le rapport Ab/Or.

Spanish

Campo(s) temático(s)
  • Mineralogía
  • Geoquímica
Save record 1

Record 2 2010-09-22

English

Subject field(s)
  • Mineralogy
Universal entry(ies)
NaAlSi3IO8
formula, see observation
DEF

A hypothetical soda feld-spar thought to be isomorphous with orthoclase.

OBS

A name formerly applied to a hypothetical high-temperature monoclinic form of albite, and later changed to "monalbite". The name was originally applied to a mineral later shown to be finely twinned microcline with about 20% of unmixed albite.

OBS

Chemical formula: NaAlSi3IO8

French

Domaine(s)
  • Minéralogie
Entrée(s) universelle(s)
NaAlSi3IO8
formula, see observation
DEF

Variété de microcline finement maclée contenant environ 20 % d'albite.

CONT

La barbiérite est une albite monoclinique excessivement rare.

OBS

Le nom barbiérite a déjà été utilisé pour désigner la monalbite.

OBS

Formule chimique : NaAlSi3IO8

Spanish

Save record 2

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