 | | Journal (article/letter/editorial) | | (Chihuahua, Mexico) BRtcIrrn ANru, Centre de Recherchessur la Giologie de I'Urqnium BP 23, 5450 1, V andoeuure-les-Nancy...Centre de Recherchessur la Giologie de l'Uranium BP 23,54501, Vaniloeuure-les-Nancy Cidex, France and Ecole...Supirieure ile Gdologie Appliquie et de Prospection Miniire ile Nancy, BP 452,54001, Nancy Cidex, France Abstrect...breccia (phase l) pipe (Debye-Scherrer and Guinier de Wolf Cameras). Within the pipe, ilmenite phenocrysts...ofsamples located in the alteration ring; (e) late opal associated with uranophane. Fluid inclusion studies |  | | Journal (article/letter/editorial) | | Universität Karlsruhe, Deutschland Ecole Supérieure de Horticulture, Chott Meriam/Sousse, Tunesien Received:...are situated south resp. north of the Tertiary “Ile de Kasserine”. While the southern deposit Kefschwaier...“normal” clay minerals like illite and kaolinite), e.g. opal- CT, chalcedony, (Cu-) Fe-sulfides and Mg-silicates...Regression bildete sich in Mitteltunesien die „Ile de Kasserine – Tebessa“, die bis zum Miozän als Insel...Untersuchungen an Phosphorit-Vorkommen 249 Um diese „Ile de Kasserine“ (s. Abb. 1) lagerten sich im Alttertiär |  | Ulrich, Marc, Muñoz, Manuel, Guillot, Stéphane, Cathelineau, Michel, Picard, Christian, Quesnel, Benoit, Boulvais, Philippe, Couteau, Clément (2014) Dissolution–precipitation processes governing the carbonation and silicification of the serpentinite sole of the New Caledonia ophiolite. Contributions to Mineralogy and Petrology, 167 (1) doi:10.1007/s00410-013-0952-8 | Journal (article/letter/editorial) | | Géoressources, CNRS, UMR 7566, Université de Lorraine, Nancy, France e-mail: marc.ulrich@univ-lorraine.fr;...Institut des Sciences de la Terre, CNRS, UMR 5275, Université de Grenoble 1, Grenoble, France Present Address:...IPGS-EOST, UMR 7516, Université de Strasbourg, Strasbourg, France tation of amorphous silica and sepiolite...Chrono-environnement, UMR 6249, Université de Franche-Comté, Besançon, France B. Quesnel P. Boulvais Géosciences...Rennes, CNRS, UMR 6118, Université de Rennes 1, Rennes, France C. Couteau Service Géologique, Koniambo |  | Fritsch, Emmanuel, Gaillou, Eloïse, Ostroumov, Mikhail, Rondeau, Benjamin, Devouard, Bertrand, Barreau, Alain (2004) Relationship between nanostructure and optical absorption in fibrous pink opals from Mexico and Peru. European Journal of Mineralogy, 16 (5) 743-751 doi:10.1127/0935-1221/2004/0016-0743 | Journal (article/letter/editorial) | | N.), Laboratoire de Physique Cristalline & Centre de Microcaractérisation, 2 rue de la Houssinière, B...B.P. 32229, F-44322 Nantes Cedex 3, France 2Laboratoire de Planétologie et Géodynamique, U.F.R. des Sciences...2 rue de la Houssinière, B.P. 92208, F-4322 Nantes Cedex 3, France 3Universidad de Michoacan de San Nicolas...Nicolas de Hidalgo, Ciudad universitaria, Fransisco J. Mujica S/N, Apartado postal 52B, C.P. 58000 Morelia...Naturelle, Laboratoire de Minéralogie, 61, rue Buffon, F-75005 Paris, France 5Laboratoire Magmas et Volcans |  | | Report (chapter) | | E HERNANDEZ 2 1 Dpto. de Geologfa, Universidad de Salamanca, Spain 2 Insto. de Recursos Naturales y Agrobiologia...important palaeosol features, an enrichment in CT opal, oxyhydroxides mobilizations and occasional concentrations...upper levels of this cover show an enrichment in CT opal (Blanco & Cantano 1983; Blanco 1991) and an irregular...the colours of these parts of the sediments. In opal-rich profiles, it is c o m m o n to find some alunite...phyllosilicates with an upward enrichment in CT opal. The enrichment in opal is a general fact in both the Hercynian |  | | Book | | MICKAËL KRA, WHO WAS BORN IN FRANCE AND GREW UP IN IVORY COAST, IS ONE OF THE MOST IMPORTANT CREATORS...START IN NEW YORK, HE HAD HIS BREAKTHROUGH IN THE PARIS FASHION SCENE IN THE EARLY 19905 WITH HIS STUNNING...WORKING NAMIBIA ON DEVELOPING TION OF JEWELLERY PARIS-BASED DESIGNER WORKING WITH SUCH MAJOR PLAYERS...ewellD0O00kram MICKAEL KRA JEWELLERY BETWEEN PARIS GLAMOUR AND AFRICAN TRADITION Annette Braun...Vormese et al. MICKAEL KRA JEWELLERY BETWEEN PARIS GLAMOUR AND AFRICAN TRADITION ARNOLDSCHE ©2006 |  | Alleon, Julien, Bernard, Sylvain, Le Guillou, Corentin, Daval, Damien, Skouri-Panet, Feriel, Pont, Sylvain, Delbes, Ludovic, Robert, François (2016) Early entombment within silica minimizes the molecular degradation of microorganisms during advanced diagenesis. Chemical Geology, 437. 98-108 doi:10.1016/j.chemgeo.2016.05.034 | Journal (article/letter/editorial) | | UPMC, 61 rue Buffon, 75005 Paris, France. 2LHyGeS, CNRS UMR 7517, Université de Strasbourg / EOST, 1 Rue...Rue Blessig, 67084 Strasbourg, France NU SC 1 MA KEYWORDS: Experimental Silicification | Experimental...cherts remain rare (e.g., De Gregorio and Sharp, 2006; Igisu et al., 2009; De Gregorio et al., 2009, 2011;...entombed within a silica gel initially consisting of opal-A, i.e. a hydrated amorphous form of silica. Following...Panalytical X'pert Pro X-ray diffractometer (IMPMC - Paris, France) operating at 40 kV and 40 mA Co Kα radiations |  | | Journal (article/letter/editorial) | | C A T I O N IN T H E PARIS BASIN RIBET I. and THIRY M. Ecole des Mines de Paris, Centre Grologie Grnrrale...Fontainebleau, France. INTRODUCTION Almost all the tertiary lacustrine limestones from the Paris basin contain...are common to most lacustrine limestones of the Paris basin. We shall describe the typical microfacies...typical section can be described in the Calcaire de Champigny Formation of Upper Eocene age, at Pecy...euhedral quartz crystals, chalcedony is sparse while opal has never been identified with certainty. Voids |  | | Journal (article/letter/editorial) | | occurrence of sepiolite from Puyvalador, near Qudrigut, France. By W. A. WATTERS, ~V[.Sc.,Ph.D., F.G.S. New Zealand...under the action of carbon dioxide, is suggested. ILE studying a series of zoned skarn reeks from near...the southern boundary of the Qu6rigut granite, France (Wafters, 1958), the writer examined a tremolite-rieh...crystals is calcite. Moreover, no q u a r t z or opal was observed in the rock, and an a l t e r n a t...L~CROIX (A.), 1893. Min6ralogie de la France, Tome 1 (Baudry, Paris). McKI~STRY (Hugh E.), 1916. Amer |  | | Journal (article/letter/editorial) | | models of silcrete genesis derived from studies in France, Australia and the Kalahari region of southern...done in other parts of the world, particularly the Paris Basin, Australia and southern Africa. This paper...semi-arid palaeoenvironment favoured by Summerfield. In France, Thiry, Bertrand-Ayrault & Grisoni (1988a) suggested...means restricted to such settings. Work in the Paris Basin and South Australia has resulted in a new...basal parts less ordered forms of silica, such as opal, are predominant. Pedogenic silcrete facies can |  | Quesnel, Benoît, Boulvais, Philippe, Gautier, Pierre, Cathelineau, Michel, John, Cédric M., Dierick, Malorie, Agrinier, Pierre, Drouillet, Maxime (2016) Paired stable isotopes (O, C) and clumped isotope thermometry of magnesite and silica veins in the New Caledonia Peridotite Nappe. Geochimica et Cosmochimica Acta, 183. 234-249 doi:10.1016/j.gca.2016.03.021 | Journal (article/letter/editorial) | | Rennes1, UMR 6118 CNRS, 35042 Rennes Cedex, France Université de Lorraine, CNRS, CREGU, GeoRessources Lab...Lab., 54506 Vandoeuvre-les-Nancy, France c Department of Earth Science and Engineering and Qatar Carbonate...2AZ, UK d Institut de Physique du Globe de Paris, Sorbonne Paris Cité, Univ Paris Diderot, UMR 7154 CNRS...F-75005 Paris, France e Service géologique, Konimbo Nickel SAS, 98883 Voh, New Caledonia, France b Received... Faust, 1966; Brindley and Hang, 1973; Villanova-de-Benavent et al., 2014; Cathelineau et al., 2015b; |  | | Journal (article/letter/editorial) | | Département Histoire de la Terre – USM 0201 Minéralogie 61 rue Buffon, F-75005 Paris, France 2Institut des Matériaux...Laboratoire de Physique Cristalline, Equipe Matériaux Absorbants et Photoluminescents, 2, rue de la Houssinière...Houssinière – BP 32229, F-44322 Nantes Cedex 3, France 3Département de Géologie - Université Jean Monet, 23 rue...rue du Dr. P. Michelon, F-42023 St Etienne, France Abstract: Slovakian opals are found in an andesitic...properties are investigated: X-Ray Diffraction (opal-A), Raman spectra (main Raman peak at 437 cm-1) |  | Othmane, G., Allard, T., Menguy, N., Morin, G., Esteve, I., Fayek, M., Calas, G. (2013) Evidence for nanocrystals of vorlanite, a rare uranate mineral, in the Nopal I low-temperature uranium deposit (Sierra Pena Blanca, Mexico) American Mineralogist, 98 (2) 518-521 doi:10.2138/am.2013.4295 | Journal (article/letter/editorial) | | Institut de Minéralogie et de Physique des Milieux Condensés (IMPMC), UMR 7590 CNRS-UPMC/Paris VI-IRD,... Case 115, 4 place Jussieu, 75252 Paris Cedex 05, France 2 Department of Geological Sciences, University...crystals embedded in U-bearing opal, with a Ca/U ratio of ∼1. Association with opal suggests that vorlanite...Vorlanite, cubic CaUO4, uranate, nanoscale crystal, opal, Nopal Introduction Uranium migration in geological...oxidative weathering of the Peny (Massif Central, France) uranium deposit, underlining the importance of |  | | Report (issue) | | ........ ................ .......... .......... Opal (Australian) ........... .........................tourmalines at Paris Bill, i\Iaine, and Haddam Neck, Connec ticut; the increased sale of Australian opal; greater...twelvemonth, while maintaining equal dividends. The De Beers Company controls essentially the Bultfontein...operate them, its workings being confined to the De Beers, Kimberley, and Premier mines. The last-named...feet, but lower levels are 110w to be opened. The De Beers Mine has been car ried down to and beyond |  | | Book | | contrdéle des diamants, perles et pierres précieuses, Paris Chamber of Commerce and Industry In collaboration...by Librairie Larousse Originally published in France under the title Larousse des pierres précieuses:...Onicolo Onyx 158 Sardonyx 202 Turquoise 224 Opal 159 Scapolite 202 Uvarovite 231 Orthoclase...of lesser-known but equally beautiful gems. In France those gemstones not in the so-called precious family...for the Pierre and Marie Curie University in Paris, France. Jean-Paul Poirot is head of the Laboratory |  | Tribovillard, N., Bout-Roumazeilles, V., Riboulleau, A., Baudin, F., Danelian, T., Riquier, Laurent (2011) Transfer of germanium to marine sediments: Insights from its accumulation in radiolarites and authigenic capture under reducing conditions. Some examples through geological ages. Chemical Geology, 282 (3) 120-130 doi:10.1016/j.chemgeo.2011.01.015 | Journal (article/letter/editorial) | | cedex, France Université Pierre et Marie Curie-Paris 6, Institut des Sciences de la Terre de Paris, UMR...UMR CNRS 7193, 75252 PARIS cedex 05, France Université de Bourgogne, Biogéosciences Lab, UMR CNRS 5561,... 21000 Dijon, France a r t i c l e i n f o Article history: Received 1 October 2010 Received in revised...seawater into authigenic phases with no intervention of opal-secreting organisms (shuttles). To this end, we...chemgeo.2011.01.015 incorporation into biogenic opal (main opal-secreting organisms are diatoms, radiolarians |  | | Journal (issue) | | Provenance and Properties In Search of Australian Opal Winter 2015 VOLUME 51, No. 4 EDITORIAL 347 Garnets...Australia’s Opal Fields Tao Hsu, Andrew Lucas, and Vincent Pardieu Documents a trip to the renowned opal fields...Rondeau Tokyo, Japan Perth, Australia Nantes, France Timothy Adams E. Alan Jobbins George R. Rossman...Nantes, France Lucerne, Switzerland Hamburg, Germany Eloïse Gaillou Ren Lu Wuyi Wang Paris, France...Thomas M. Moses Christopher M. Welbourn Nancy, France New York, New York Reading, UK Jaroslav Hyršl |  | | Journal (article/letter/editorial) | | 2 AND M. THIRY3 1 INRA, Science du Sol, Route de Saint-Cyr, F-78026 Versailles Cedex, 2 IRD (ex ORSTOM)...rue Saint Honoré, F-77305 Fontainebleau Cedex, France (Received 11 April 1997; revised 31 August 1999)...progressive transformation into platy particles of opal-A and opal-C. These are in turn transformed into cristobalite...for a higher electron density than opal and clay. K EYWORDS: opal, cristobalite, volcanic soils, induration...layer attributed to the last eruption of the Cofre de Perote volcano (late Pleistocene, 3.88 My BP) overlies |  | | Journal (issue) | | What’s New CIBJO 2023 Conference Reports and Videos | De Beers Diamond Insight Report 2023 | Ethical Metalsmiths...2023–2024 | Jewellery Consumer Trends in China | De Beers Group Sightholder Summit 2023 Presentations...Sugar-AcidTreated Opal 746 An Historical Alexandrite from the Mineralogy Museum of Paris School of Mines...759 796 810 20th Rendez-Vous Gemmologiques de Paris | Gem-A Conference | 37th International Gemmological...Stefanos Karampelas Laboratoire Français de Gemmologie, Paris, France Alessandra Costanzo National University |  | | Journal (article/letter/editorial) | | 1089/ast.2012.0889 Raman Imaging of Metastable Opal in Carbonaceous Microfossils of the 700–800 Ma Old...phases of substances such as carbonaceous matter, opal, or hydroxyapatite that are associated with the...cherty lenses Centre de Biophysique Moléculaire, UPR CNRS 4301, Orléans, France. 57 58 SiOH-bearing...Svanbergfjellet, from Spitsbergen). Association of opal with carbonaceous microfossils in the 1.9 Ga old...metamorphism. A sample from the quarry of Mazerier (France) was used to study the influence of the biological |  | Sarazin, G., Gaillard, J.-F., Philippe, L., Rabouille, C. (1993) Organic matter mineralization and nutrient fluxes at the sediment-water interface of a eutrophic lake (Aydat Lake, Puy de Dôme, France) Chemical Geology, 107 (3) 471-476 doi:10.1016/0009-2541(93)90234-a | Journal (article/letter/editorial) | | Lake, Puy de D6me, France) G. Sarazin, J.-F. Gaillard, L. Philippe and C. Rabouille Laboratoire de Gbochimie...des Eaux (U.A. 196), Universitb Paris 7, F- 75251 Paris Cedex 05, France (Received March 17, 1993; revised...diatom frustules. Thus the silica phase is biogenic opal and the allogenic contribution of solid material...with Fe (II). Such a coexistence has been shown by De Vitre et al. ( 1988 ) in depositing particles accumulated...with depth in the sediment for these minerals. For opal, saturation is reached when z = 5 cm and ~2 remains |  | | Journal (article/letter/editorial) | | and aggregates. Similar particles consisting of opal-CT were found in surface exposures of chalk in Denmark...in the free-water phase as opal and were diagenetically transformed from opal-CT at low temperature to...their dissolution supplied enough Si to precipitate opal-CT in the free-water phase. KEYWORDS: flocculation...phosphatization and silicification including formation of opal lepispheres (Pomerol & Aubry, 1977; Deconinck &...SEM and transmission electron microscopy (TEM) in opal-CT flint bodies which were thought to consist of |  | Bendel, Valerie, Fouquet, Yves, Auzende, Jean-Marie, Lagabrielle, Yves, Grimaud, Daniel, Urabe, Tetsuro (1993) The White Lady hydrothermal field, North Fiji back-arc basin, Southwest Pacific. Economic Geology, 88 (8) 2237-2245 doi:10.2113/gsecongeo.88.8.2237 | Journal (article/letter/editorial) | | Occidentale, 6 avenue Le Gorgeu, 29287BrestCedex, France YvEs FOUQUET, IFREMER,Centrede Brest,B.P. 70, 29280Plouzand..."Gendse et EvolutiondesDomainesOcdaniques," Brest,France JEAN-MARIE AUZENDE,** IFREMER,Centrede Brest,B..."Gen&eet EvolutiondesDomainesOcdaniques," Brest,France YvES LAGABRIEI GDR"Gendse etEvolution desDomaines...Gorgeu, 29287BrestCedex, France DANIEL GIllMAUD, Uaiversitd ParisVII, Laboratoire de Gdochimie desEaux,Tour54...Tour54, 4 Place]ussieu,75252ParisCedex05, France AND TETSURO URABE Geological SurveyofJapan,Higashi,Tsukuba |  | | Book | | if the faces are on a plane without elevations or de pressions ; 2d. Uneven ; 3d. Conchoidal, exhibiting...Spinelle, Garnet. 2. SEMI-HARD GEMS. Rock Crystal, Opal, Amethyst, Chrysolite, Chalcedony, Lazulite, Carneleon...gravity of the lighter substance is the result. And for de termining the specific gravity of liquids, by means...2.68 2.71 Rock Crystal, Citron, - 2.60 2.69 Fire-opal, 1.90 2.12 GREEN GEMS. Zircon, - 4.41 4.50 Sapphire...73 2.56 Adularia, 2.60 - 2.50 2.60 2.50 Precious Opal, --2.10 - 2.00 Hydrophane, 2.00 1.90 A number of |  | Gehlen, M., Beck, L., Calas, G., Flank, A.-M., Van Bennekom, A.J., Van Beusekom, J.E.E. (2002) Unraveling the atomic structure of biogenic silica: evidence of the structural association of Al and Si in diatom frustules. Geochimica et Cosmochimica Acta, 66 (9) 1601-1609 doi:10.1016/s0016-7037(01)00877-8 | Journal (article/letter/editorial) | | BEUSEKOM6 1 Laboratoire des Sciences du Climat et de l’Environnement (LSCE), Orme des Merisiers, Bât...Gif-sur-Yvette cedex, France 2 Laboratoire de Minéralogie-Cristallographie, Universités Paris 6 et 7 and IPG...75252 Paris cedex, France 3 LEMFI/INSTN-DRECAM, CEA/Saclay, 91191 Gif-sur-Yvette cedex, France 4 LURE...CEA/CNRS/MEN, Bât. 209D, BP 34, 91898 Orsay cedex, France 5 NIOZ, P.O. Box 59, 1790 AB Den Burg, the Netherlands...there is to date no conclusive evidence for the opal synthesized by diatoms. A straightforward analogy |
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