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MACLE ALBITE [2 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2011-12-22

English

Subject field(s)
  • Mineralogy
OBS

Plagioclase twins mechanically on the albite law. Twinning is most likely to occur when the resolved shear stress ... is at a maximum. Only those crystals oriented in the stress field to approximately meet this condition will twin. Thus, in a rock containing mechanically twinned grains, the principal stress directions affecting the rock may be approximated by measuring the twin elements of these grains.

OBS

albite-twinned plagioclase: term used at Natural Resources Canada - Earth Sciences Sector.

French

Domaine(s)
  • Minéralogie
CONT

Entre les masses biotitiques apparaissent des agrégats de plagioclases maclés albite et d'aspect trouble, auxquels s'associent de très rares cristaux de quartz et de minuscules grains d'opaques.

Spanish

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Record 2 1998-03-12

English

Subject field(s)
  • Mineralogy
CONT

If the regions are related such that they share a common c direction, the twin plane being the old mirror plane of the monoclinic structure, the twin is termed an albite twin.

CONT

Albite twin. The plagioclase feldspars, particularly albite ..., are frequently twinned on the albite law ... where the twin-plane and composition plane is (010). This twinning is often repeated to give a series of five lamellae, seen in the hand specimens as striations...; such twinning is usually called "polysynthetic" or "lamellar" twinning.

French

Domaine(s)
  • Minéralogie
CONT

La macle de l'albite, dite encore polysynthétique, donne en lumière polarisée une alternance de bandes claires et foncées.

OBS

macle : Assemblage régulier de deux ou plusieurs individus cristallins de même nature. [...] Ces macles sont très fréquentes dans les minéraux (ex. gypse, quartz, pyrite, aragonite, rutile, albite, péricline, fluorite, or, etc.).

Spanish

Save record 2

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