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Raman microprobe (RMP) determinations of natural and synthetic coesite |
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| Authors: | Helgard Boyer David C Smith Christian Chopin Bernard Lasnier |
| Institution: | 1. Instruments S.A., Jobin Yvon, 16, rue du Canal, 91163, Longjumeau Cedex, France 2. Laboratoire de Minéralogie, CNRS Lab. Associé 286, Muséum National d'Histoire Naturelle, 61 rue de Buffon, 75005, Paris, France 3. Laboratoire de Géologie, E.R. 224, Ecole Normale Supérieure, 46, rue d'Ulm, 75005, Paris, France 4. Laboratoire de Pétrologie, Université de Nantes, 2, chemin de la Houssinière, 44072, Nantes, France |
| Abstract: | Raman microprobe (RMP) spectra of synthetic coesiste and three natural coesites from eclogite — facies rocks are provided and evaluated for characterisation purposes. The main coesite line lies at 521 cm?1 and the other characteristic lines attributed to coesite occur at 117, 177 and 271 cm?1. Two petrologically useful applications were (a) the confirmation of the coesite structure in very small natural crystals deduced to be coesite from petrographic observations only, and (b) the recognition of sub-microscopic crystallites of quartz in incipiently — transformed coesite in all the natural samples. |
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