 | | Book | | Fritsch (IMN-CNRS, Nantes, France), Pr. Benjamin Rondeau (University of Nantes, France), and Dr. Jaroslav Hyrsl...Nantes, France. He completed his PhD in Materials Physics from the University of Nantes (France) and the...gemmological laboratories appeared in the United Kingdom, France, the United States of America and Germany, soon...lazuli, nephrite ‘jade’), different forms of silica (quartz, amethysts, agate, chalcedony, opal etc.), amber...cultures worked mostly on hard material such as quartz and chalcedony before 1100 BCE, some of lenticular |  | | Journal (issue) | | Gemological Discoveries Gerard Panczer, Geoffray Riondet, Lauriane Forest, Michael S. Krzemnicki, Davy Carole...diamond discovered in North America • Chatoyant quartz/tourmaline doublet • Faceted gahnospinel • Glass...Rondeau Tokyo, Japan Perth, Australia Nantes, France Timothy Adams E. Alan Jobbins George R. Rossman...Fritsch Lore Kiefert Nicholas Sturman Nantes, France Lucerne, Switzerland Bangkok, Thailand Eloïse...Eloïse Gaillou Ren Lu Fanus Viljoen Paris, France Wuhan, China Johannesburg, South Africa Gaston Giuliani |  | | Journal (issue) | | daylight-fluorescent opal from Mexico|‘Trapiche’ quartz with radiating fibres|Yellow scheelite from Pakistan|Spessartine...Washington, USA; Emmanuel Fritsch, University of Nantes, France; Rui Galopim de Carvalho, Portugal Gemas, Lisbon... Practical Gemmology Figure 2: The B/D ratio of quartz is 0.6, which corresponds to the 60% overlap in...available. The transparent quartz varieties of amethyst, citrine, smoky quartz and rock crystal are easily...B/D ratio of quartz (0.6), but what exactly does this number convey? When a faceted quartz is observed |  | | Journal (issue) | | example, Valle d'Arbedo, Switzerland; Chantel, France; Harts Range, Australia. A general overview is...assemblage 391 Identification of an impregnated quartz imitation of jade T.L. Tan1, T.S. Tay2, B.L. Tan1...impregnated quartz imitations of jade show strong absorption peaks which correspond to those of quartz and of...O/Si in the investigated jadeite imitations and in quartz using EDXRF spectroscopy support the finding that...that the imitation is polymer-impregnated quartz. The EDXRF results from the imitations are compared to |  | | Journal (issue) | | International Colored Gemstone Association Yen Thi Ngoc Le, ICA Ambassador to Vietnam, wearing her design with...May, directly after the Salon International de la Haute Horlogerie (SIHH) in Geneva. This decision made...■ Above: Cristobalite crystal suspended in its quartz mineral host; darkfield technique; 40x magnification...types: rare-metal veins, including pegmatite and quartz-plagioclase veins; and metasomatic complexes. Among...splices were not observed. In micas, as well as in quartz-plagioclase veins, it forms inclusions in fluorite |  | | Book | | 3390/min9040233 . . . . . . . . . . . . . . . . . . . . 6 Le Thi-Thu Huong, Laura M. Otter, Michael W. Förster...Xydous On the Color and Genesis of Prase (Green Quartz) and Amethyst from the Island of Serifos, Cyclades...[34] focus on the genesis of prase (green-coloured quartz) and amethyst from Serifos Island (Cyclades, Greece)...oxygen and hydrogen isotopic composition of both quartz varieties suggest a mixing of magmatic and meteoric...[CrossRef] Giuliani, G.; Fallick, A.E.; Garnier, V.; France-Lanord, C.; Ohnenstetter, D.; Schwarz, D. Oxygen |  | | Journal (issue) | | Washington, USA Emmanuel Fritsch University of Nantes, France Alan D. Hart Gem-A, London Karl Schmetzer Petershausen...Karampelas Laboratoire Français de Gemmologie, Paris, France Lore Kiefert Dr. Lore Kiefert Gemmology Consulting... produced large aquamarine crystals frozen in quartz, as well as etched aquamarine in cavities. Much...displays a six-rayed star in reflected light. Photos by Le Ngoc Nang. b The sample described here was cut...so far received little interest in the gem trade. LE Ngoc Nang 1,2 (nang@liulab.edu.vn) and PHAM Minh |  | | Journal (issue) | | Indonesia | Three-Rayed Asterism in Quartz: A Multi-Star Network | Quartz with Kyanite Inclusions from Brazil...Karampelas Laboratoire Français de Gemmologie, Paris, France Alessandra Costanzo National University of Ireland...Washington, USA Emmanuel Fritsch University of Nantes, France Rui Galopim de Carvalho Gem Education Consultant...Gérard Panczer Claude Bernard University Lyon 1, France Jeffrey E. Post Smithsonian Institution, Washington...measures 30.48 × 21.81 mm. Photo by Jeff White. rose quartz, and therefore were not actively collecting it |  | | Journal (issue) | | Synthetic Opal | Quench-Fractured Bicoloured Synthetic Quartz By Radek Hanus, Kamil Sobek, Kamila Johnová, Tomáš...Washington, USA Emmanuel Fritsch University of Nantes, France Alan D. Hart Gem-A, London Karl Schmetzer Petershausen...Karampelas Laboratoire Français de Gemmologie, Paris, France Lore Kiefert Dr. Lore Kiefert Gemmology Consulting... such as phlogopite, talc, albite and possibly quartz (Gübelin & Koivula 1986; Moroz & Eliezri 1999)...Gübelin and Koivula (1986) was suggested to be quartz. Zircon inclusions in emeralds have only rarely |  | | Journal (issue) | | Japan Emmanuel Fritsch University of Nantes, France Michael S. Krzemnicki Swiss Gemmological Institute... Surrey Benjamin Rondeau University of Nantes, France Jeff W. Harris University of Glasgow George R...Among the numerous optical phenomena displayed by quartz are asterism and chatoyancy. However, amethyst...trapiche-like textures have also been encountered in other quartz varieties (e.g. Krzemnicki & Laurs 2014; Wang &...pattern developed along the basal pinacoid of the quartz crystal. Each arm started its growth from one side |
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