Large-angle convergent-beam electron diffraction (LACBE
- journal_title：European Journal of Mineralogy
- Contributor：Damien Jacob ; Patrick Cordier ; Jean-Paul Morniroli ; Hans-Peter Schertl
- Publisher：E. Schweizerbart'sche Verlagsbuchhandlung Science Publishers
- Date：2008-
- Format：text/html
- Language：en
- Identifier：10.1127/0935-1221/2008/0020-1786
- journal_abbrev：Eur J Mineral
- issn：0935-1221
- volume：20
- issue：1
- firstpage：119
- section：Articles
摘要
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.