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Large-angle convergent-beam electron diffraction (LACBED) characterization of (021) twinning in natural coesite

¹ Laboratoire de Structure et Propriétés de l’Etat Solide - UMR CNRS 8008, Université des Sciences et Technologies de Lille – Bât. C6, 59655 Villeneuve d’Ascq Cedex, France
² Laboratoire de Métallurgie Physique et Génie des Matériaux, UMR CNRS 8517, Ecole Nationale Supérieure de Chimie de Lille, Université des Sciences et Technologies de Lille – Bât. C6, 59655 Villeneuve d’Ascq Cedex, France
³ Institut für Geologie, Mineralogie und Geophysik, Ruhr-Universität Bochum, 44780 Bochum, Germany

^* Corresponding author, e-mail: damien.jacob{at}univ-lille1.fr

Large-angle convergent-beam electron diffraction (LACBED) is used to characterize a (021) twinning in metamorphic coesite from Parigi, Dora-Maira Massif, Western Alps. The orientation relationships between the adjacent parts of the twin are characterized in detail and the twin is described as a mirror along (021). This microscopic description is fully consistent with original descriptions of twinning in synthetic coesite. Due to the quasi-hexagonal dimensions of coesite (belonging to the monoclinic space group C12/c1 with a ~ c and β ~ 120°) such a result could not have been obtained using conventional electron diffraction experiments.

Key-words: coesite, twin, TEM, LACBED.

This article has been cited by other articles:

				H. Idrissi, P. Cordier, D. Jacob, and N. Walte Dislocations and plasticity of experimentally deformed coesite European Journal of Mineralogy, August 1, 2008; 20(4): 665 - 671. [Abstract] [Full Text] [PDF]