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Karampelas, S., Fritsch, E., Zorba, T. & Paraskevopoulos, K. M. (2011) INFRARED SPECTROSCOPY OF NATURAL VS. SYNTHETIC AMETHYST: AN UPDATE. Gems Gemol. 47 196–201.
Added by: Laurent Cournède (2016-03-10 21:32:20) |
| Type de référence: Article DOI: 10.5741/GEMS.47.3.196 Numéro d'identification (ISBN etc.): 0016-626X Clé BibTeX: Karampelas2011 Voir tous les détails bibliographiques  |
Catégories: MIOPS Mots-clés: identification, quartz, region Créateurs: Fritsch, Karampelas, Paraskevopoulos, Zorba Collection: Gems Gemol. |
Consultations : 8/363
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| Résumé |
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When microscopic identification is not feasible, FTIR spectra at high resolution (0.5 cm(-1)) can distinguish natural and synthetic amethyst. The 3595 cm(-1) band is characteristic of natural amethyst and has a full width at half maximum (FWHM) of 3.3 +/- 0.6 cm(-1). In synthetic amethyst, this band is either absent or (very rarely) about twice as broad. Exceptions to this criterion include natural amethyst with pronounced near-colorless zones, which do not always display this band, and natural specimens that either have an intense, unusually broad 3595 cm(-1) band or show total absorption in the X-OH region (3800-3000 cm(-1)) of the spectrum.
Added by: Laurent Cournède |