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Rondeau, B., Fritsch, E., LeFevre, P., Guiraud, M., Fransolet, A.-M. & Lulzac, Y. (2006) A Raman investigation of the amblygonite-montebrasite series. Can. Mineral. 44 1109–1117.
Added by: Florent Boucher (2016-05-12 13:21:36) |
| Type de référence: Article DOI: 10.2113/gscanmin.44.5.1109 Numéro d'identification (ISBN etc.): 0008-4476 Clé BibTeX: Rondeau2006 Voir tous les détails bibliographiques  |
Catégories: PMN Mots-clés: amblygonite, fluorine content, gemstones, mas, montebrasite, Raman spectroscopy, spectroscopy Créateurs: Fransolet, Fritsch, Guiraud, LeFevre, Lulzac, Rondeau Collection: Can. Mineral. |
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In order to obtain a more accurate method of identification of minerals of the amblygonite - montebrasite series, and particularly of gemstones cut from these minerals, we undertook an investigation by Raman spectroscopy, which is known to be a non-destructive method. Therefore, nine rough minerals and gemstones of the amblygonite-montebrasite series were analyzed by Raman spectroscopy, X-ray diffraction, infrared absorption spectroscopy, and the gemological properties (density and indices of refraction) of seven faceted gemstones were measured. Firstly, the Raman signal seems to be a good indicator of the fluorine content in the specimens, and thus useful for an accurate identification. Three peaks evolve significantly as F content increases: from 599 to 604 cm(-1), from 1056 to 1066 cm-1 and from 3379 to 3348 cm(-1). Also, the FWMH of the peak around 3370 cm(-1) increases from 11 to 57 cm(-1) as F content increases. Secondly, we found that all faceted gemstones studied herein consist of montebrasite and not amblygonite as usually claimed by gemstones traders.
Added by: Florent Boucher |