TERMIUM Plus®

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HEMISYMMETRIC [1 record]

Record 1 2005-07-05

English

Subject field(s)
  • Mineralogy
DEF

Said of the merohedral crystal class (or classes) in a system, the general form of which has half the number of equivalent faces of the corresponding holohedral form.

French

Domaine(s)
  • Minéralogie
DEF

Se dit d'un cristal présentant l'hémiédrie.

Spanish

Campo(s) temático(s)
  • Mineralogía
DEF

Dícese del cristal que posee la hemiedria.

CONT

En un cristal hemiédrico los átomos se encuentran ordenados de tal forma que desaparece uno de los elementos de simetría. La blenda, por ejemplo, cristaliza en forma de cubos pero su simetría es la de un tetraedro. Una troncadura de uno de sus vértices no se repite en los otros siete, sino solamente en tres. En el caso de que esas troncaduras se extiendan en la masa del cristal, pueden llegar a formarse dos tetraedros conjugados cuyas caras no tienen las mismas propiedades.

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