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POLYTYPY [1 record]

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Record 1 2001-08-14

English

Subject field(s)
  • Mineralogy
  • Geochemistry
DEF

The property of a mineral to crystallize in more than one form, due to more than one possible mode of atomic packing; a form of one-dimensional polymorphism.

OBS

Such a mineral is a "polytype."

French

Domaine(s)
  • Minéralogie
  • Géochimie
CONT

Certains minéraux lamellaires montrent des variations résidant uniquement dans l'empilement des lamelles qui constituent leurs cristaux. Ce phénomène, appelé polytypisme [...], est important pour les phyllosilicates [...], la blende et le graphite.

CONT

[Les chlorites et serpentines] peuvent être constitués de couches différentes les unes des autres : par exemple un feuillet type mica suivi d'un feuillet de type brucite, et d'un autre de type talc [...] On parle alors de «polytypie» ou «d'hétéropolytypie» ou de minéraux à couches mélangées.

Spanish

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