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ANORTHOSE [1 record]

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Alphabetical list of terms

Record 1 2011-07-26

English

Subject field(s)
  • Mineralogy
DEF

A triclinic mineral of the alkali feldspar group that consists of a high-temperature sodium-potassium feldspar widespread in alkalic lavas.

OBS

Those apparently monosymmetric feldspars with notable amount of soda may be called soda orthoclase. When the soda equals or exceeds the potash, the crystals exhibit triclinic symmetry and are soda microcline.

OBS

anorthoclase: So named in allusion to the slight deviation from 90° of the prismatic cleavage.

French

Domaine(s)
  • Minéralogie
DEF

Feldspath alcalin riche en sodium [...], triclinique, fréquent dans les laves alcalines.

CONT

Anorthose. Ce nom est appliqué aux orthoses sodiques, à celles qui contiennent de l'albite en solution solide [...] Ces mélanges isomorphes ont une tendance à la symétrie monoclinique [...]

CONT

Le microcline : même aspect macroscopique que l'orthose, mais triclinique. [...] Une variété sodique, l'anorthose, aux reflets bleutés, se rencontre dans la laurvikite.

Key term(s)
  • microcline sodique

Spanish

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