Descripción de la macla de la frondelita-rockbridgeita asociada a las pegmatitas del Macizo de L´Arize, Pirineos (Ariege).

  1. F. Fontan 1
  2. E. Roda 2
  1. 1 Laboratoire de Minéralogie, (U. R. A. 067), Université Paul Sabatier, 39 Allées Jules Guesde, 31000, Toulouse, Francia.
  2. 2 Dpto. Mineralogía y Petrología, Universidad del País Vasco/EHU, Apdo. 644, 48080 Bilbao.
Aldizkaria:
Geogaceta

ISSN: 0213-683X

Argitalpen urtea: 1996

Zenbakia: 20

Orrialdeak: 1524-1526

Mota: Artikulua

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Beste argitalpen batzuk: Geogaceta

Laburpena

A cruciform intergrowth in a phosphate of the frondelite-rockbridgeite series associated with beryl-columbite pegmatites is studied on the basis of geometric considerations. The crystallographical calculations prove, for the first time, the existence of a reticular pseudomeroedric twinning in frondelite, having as twin plane the (041), an obliquity of =3 and a twin index =7, which may explain the rarity of this twinning.

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