Opale

Stéphant N., Rondeau B., Gauthier J.-P., Cody J.A., Fritsch E. (2014) Investigation of hidden periodic structures on SEM images of opal-like materials using FFT and IFFT. Scanning, vol.35, n°5, pp. 487-499.

Rondeau B., Chauviré B., Mazzero F., Ayalew D., Fritsch E. (2013) Géologie et gemmologie de l'opale. Géochronique, n° 128, pp. 31-37.

Gauthier J.-P., Mazzero F., Rondeau B., Fritsch E. (2013) De l'originalité des opales éthiopiennes. Revue de Gemmologie a.f.g., vol. 184, pp.11-16.

Rondeau B., Gauthier J.-P., Mazzero F., Fritsch E., Bodeur Y., Chauviré B. (2013) On the origin of digit patterns in opal. Gems & Gemology, vol. 49, n°4, pp.138-146.

Rondeau B., Gauthier J.-P., Fritsch E. (2012) Gem News International: Naturally healed fractures in Ethiopian opals. Gems & Gemology, vol. 48, n°4, pp. 306-307.

Rondeau B., Fritsch E., Mazzero F., Gauthier J.-P. (2011) Opal: the craze for stability. In Color, Winter 2011, n°4, pp.42-45.

Rondeau B., Cenki-Tok B., Fritsch E., Mazzero F., Gauthier J.-P., Bodeur Y., Bekele E., Gaillou E., (2012) Geochemical and petrological characterization of gem opals from Wegel Tena, Wollo, Ethiopia: opal formation in an Oligocene soil. Geochemistry : Exploration, Environment, Analysis , vol.12, pp.93-104.

Rondeau B., Fritsch E., Bodeur Y., Mazzero F., Cenki T., Bekele E., Ayalew D., Gauthier J.-P. (2011) Play-of-color opal at Wegel-Tena, Wollo, Ethiopia. In Color, vol. 17, n°3, pp. 2-13.

Rondeau B., Fritsch E., Mazzero F., Ayalew D., Bodeur Y. (2011) Amazing play-of-color opals from Wollo, Ethiopia; toward a pedogenetic model. Gems & Gemology, vol. 47, n°2, p 112.

Rondeau B., Fritsch E., Mazzero F., Gauthier J.-P. (2011) Gem News International: Sugar-acid treatment of opal from Wollo, Ethiopia. Gems & Gemology, vol. 47, n°4, pp. 333-334.

Mazzero F., Désagulier C., Rondeau B., Ayalew D., Ezezew G., Cenki T., Bekele E. (2010) L’opale du Wollo, Ethiopie : des mines de gisements. Revue de gemmologie a.f.g., vol. 174, pp. 14-20.

Rondeau B., Fritsch E., Gauthier J.-P., Mazzero F., Cenki-Tok B., Bekele E., Gaillou E. (2010) Play-of-color opal at Wegel Tena, Wollo, Ethiopia. Gems & Gemology, vol. 46, n°2, pp. 90-105.

Fritsch E., Gaillou E., Massuyeau F., Rondeau B. (2010) Luminescence of opals: a witness to their geochemistry. Geochimica et Cosmochimica Acta, vol. 74, n°12, p. A307.

Rondeau B., Fritsch E., Cenki-Tok B., Mazzero F. (2010) New opals from Wollo, Ethiopia: geochemical characterization. Geochimica et Cosmochimica Acta, vol.74, n°12, p. A880.

Tay T.-S., Mok P.C., Paul S.L., Paramita M., Arps C.E.S., Atichat W., Fritsch E., Kang W.W., Wijaya K. (2009) Precious opal from Java : Gemmological properties, macro- and nano-structures. The Australian Gemmologist, vol. 23, pp. 513-528.

Fritsch E., Lulzac Y., Rondeau B. (2009) Gem News International: Common opal from Argentina. Gems & Gemology, vol. 45, n°3, pp. 220-221.

Fritsch E., Feydieu C., Fauran J., Lulzac Y., Rondeau B. (2009) Gem News International: A chalcedony-opal cameo with remarkable inclusions. Gems & Gemology, vol. 45, n°2, pp. 143-144.

Fritsch E., Rondeau B. (2009) Gem News International: Rare optical phenomenon in play-of-color opal. Gems & Gemology, vol. 45, n°2, pp. 147-148.

Fritsch E., Feydieu C., Fauran J., Lulzac Y., Rondeau B. (2009) Un camée exceptionnel d’opale et de calcédoine. Revue de Gemmologie a.f.g., vol. 168, pp. 4-7.

Mazzero F., Gauthier J.-P., Rondeau B., Fritsch E., Bekele E. (2009) Nuovi giacimenti di opale etiope nella provincia di Welo : prima informazioni. Rivista Gemmologica Italiana, Vol. 4, No. 2, pp. 85-89.

Mazzero F., Gauthier J.-P., Rondeau B. , Fritsch E., Bekele E. (2009) Nouveau gisement d'opales d'Ethiopie dans la Province du Welo : premières informations. Revue de Gemmologie a.f.g., vol. 167, pp 4-5.

Rondeau B., Mazzero F., Bekele E., Gauthier J.-P., Fritsch E. (2009) Gem News International: New play-of-color opal from Welo, Ethiopia. Gems & Gemology, vol. 45, n°1, pp. 59-60.

Gauthier J.-P., Mazzero F., Mandaba Y., Fritsch E. (2008) L’opale Etiopie : gemmologia ordinaria e caratteristiche eccezionali. Rivista Gemmologica Italiana Vol. 3, No. 2, pp. 85-96.

Gaillou E., Fritsch E., Rondeau B., Aguilar-Reyes B., Barreau A., Ostroumov M., Post J. (2008) Common gem opal: An investigation of micro- to nano-structure. American Mineralogist, vol. 93, pp. 1865-1873.

Gaillou E., Delaunay A., Rondeau B., Bouhnik-le Coz M., Fritsch E., Cornen G., Monnier C. (2008) The geochemistry of opals as an evidence for their origin. Ore Geology Reviews, vol. 34, pp. 113-126.

Paris M., Fritsch E., Aguilar-Reyes B.O. (2007) 1H, 29Si and 27Al NMR study of the destabilization process of a paracrystalline opal from Mexico. Journal of Non-crystalline Solids. Vol. 353, pp. 1650-1656.

Gaillou E., Delaunay A., Fritsch E., Bouhnik-LeCoz M. (2006) Geologic origin of opals deduced from geochemistry. Gems & Gemology, Vol. 42, No. 3, pp. 107.

Fritsch E., Gaillou E., Rondeau B., Barreau A., Albertini D., Ostroumov M. (2006) The nanostructure of fire opal. Journal of Non-Crystalline Solids, vol. 352, pp. 3957-3960.

Aguilar Reyes B.O, Ostrooumov M., Fritsch E. (2005) Estudio mineralogico de la desestabilizacion de opalos mexicanos. Revista Mexicana de Ciencas Geologicas, vol. 22, No. 3, pp. 391-400.

Gauthier J.-P., Fritsch E., Barreau A., Aguilar-Reyes B. & Lasnier B. (2004) Phase de Laves dans la première opale CT bidisperse. Comptes Rendus de l’Académie des Sciences – Géosciences, Vol. 336, No. 3, pp. 187-196.

Gauthier J.-P., Mazzero F., Mandaba Y., Fritsch E. (2004) L'opale d'Ethiopie : gemmologie ordinaire et caractéristiques exceptionnelles. Revue de Gemmologie a.f.g., No. 149, pp. 15-23.

Fritsch E., Berthier S. (2004) Les opales de coléoptères. Revue de Gemmologie a.f.g., No. 150, pp. 22-23.

Rondeau B., Fritsch E., Guiraud M., Renac C. (2004) Opals from Slovakia ("Hungarian" opals): a re-assessment of the conditions of formation. European Journal of Mineralogy, vol. 16, pp. 789-799.

Fritsch E., Gaillou E., Ostroumov M., Rondeau B. Barreau A. (2004) Relationship between nanostructure and optical absorption in fibrous pink opals from Mexico and Peru. European Journal of Mineralogy, vol. 16, pp. 743-752.

Fritsch E., Wéry J., Jonusauskas G., et Faulques E. (2003) Transient photoluminescence from highly disordered silica-rich natural phases with and without nanostructures. Physics and Chemistry of Minerals, Vol. 30, No. 7, pp. 393-400.

Gauthier J.-P., Fritsch E. (2003) Une rareté structurale : l'opale noble bidisperse. Revue de Gemmologie a.f.g., No. 148, pp. 32-35.

Fritsch E., Ostrooumov M., Rondeau B., Barreau A., Albertini D., Marie A.-M., Lasnier B., Wery J. (2002) Mexican gem opals: nano- and micro-structure, origin of colour, comparison with other common opals of gemmological significance. Australian Gemmologist, vol. 21, pp. 230-233.

Faulques E., Fritsch E., Ostroumov M. (2001) Spectroscopy of natural silica-rich glasses. Journal of Mineralogical and Petrological Sciences, Vol. 96, pp. 120-128

Fritsch E., Mihut L., Baibarac M., Baltog I., Ostrooumov M., Lefrant S., Wery J. (2001) Luminescence of oxidized porous silicon : surface-induced emissions from disordered silica micro- to nano-structures. Journal of Applied Physics, Vol. 90, No. 9, pp. 4777-4782.

Fritsch E., Wery J., Ostrooumov M. (1999) Classification of gem opals using Raman spectroscopy. Gems & Gemology, Vol. 30, No. 3, pp. 145.

Ostrooumov M., Fritsch E., Lasnier B., Lefrant S. (1999) Spectres Raman des opales : aspect diagnostique et aide à la classification. European Journal of Mineralogy, Vol. 11, pp. 899-908.

Fritsch E., Lasnier B., Ostrooumov M., Wery J. (1999) Classification of gem opals using Raman spectroscopy. Indian Gemmologist, Vol. VIII, pp. 39-40.

Ostroumov M., Fritsch E., Lefrant S. (1999) Primeros datos sobre la espectrometria Raman de los opalos. Revista Mexicana de Ciencias Geologicas, Vol. 16, No. 1, pp. 73-80.

Fritsch E., Rondeau B., Ostrooumov M., Lasnier B., Marie A.M., Barreau A., Wery J., Connoué J., Lefrant S. (1999) Découvertes récentes sur l’opale. Revue de gemmologie a.f.g. vol. 138/139, pp. 34-40.

Marie A.-M., Ostrooumov M., Wery J., Fritsch E., Lasnier B., Lefrant S. (1998) Electron microscopy of common opal structure. Electron Microscopy 98, Symposium II, Vol. IV, pp.145-146.

Informations supplémentaires