 | | Journal (issue) | | July 2004 ISSN: 1355^1565 129 Gem corundum deposits in Vietnam Pham Van Long1, Hoang Quang Vinh2,...Trinh2 1. Vietnam National Gem and Gold Corporation, 91 Dinh Tien Hoang Street, Hanoi, Vietnam 2. Institute...Geological Sciences, CNST, Nghia Dô, Câu Giây, Hanoi, Vietnam 3. CRPG/CNRS, UPR 2300, BP 20, 54501 Vandœuvre...recovered from the Luc Yen and Quy Chau mining areas in northern Vietnam. Since 1991, 'basaltic'-type blue-green-yellow...('BGY') sapphires have been mined in southern Vietnam. This article briefly reviews the history and geology |  | | Journal (issue) | | Alice S. Keller Rubies and Fancy Sapphires from Vietnam Robert E. Kane, Shane F. McClure, Robert C. Kammerling...have emerged from new deposits in Tanzania and Vietnam that closely resemble Burmese stones and probably...sapphires illustrated here, all reported to be from Vietnam, are representative of some of the fine material...changing economic outlook of countries such as Vietnam and Tanzania, promises both new markets and new...Summer 1991 issue of Gems o) Gemology, we featured an article on a new production of emeralds from the |  | Giuliani, Gaston, Groat, Lee, Fallick, Anthony, Pignatelli, Isabella, Pardieu, Vincent (2020) Ruby Deposits: A Review and Geological Classification. Minerals, 10 (7) 597 doi:10.3390/min10070597 | Journal (article/letter/editorial) | | Published: 30 June 2020 Abstract: Corundum is not uncommon on Earth but the gem varieties...of ruby and sapphire are relatively rare. Gem corundum deposits are classified as primary and secondary...secondary deposits. Primary deposits contain corundum either in the rocks where it crystallized or as xenocrysts...systems for corundum deposits are based on different mineralogical and geological features. An up-to-date...is the red gem variety of the mineral corundum. The name corundum was introduced in the early 19th century |  | | Journal (issue) | | .......................................... 56 Vietnam..................................................the amazing array of gems and gem people. Even for an experienced gemologist or gem dealer nowadays it...organization is in a better position to produce such an impressive and current report, which we hope will...Australian government and local indigenous landholders for an extension of the fields. Since March, both Australian...shown been visiting the fields. by Richard Osmond, an Meanwhile, only 40 or so associate of Candala Mining |  | | Journal (issue) | | Mining Rubies and Fancy Sapphires in Northern Vietnam Robert C. Kammerling, Alice S. Keller, Kenneth...Created Gems i n Piraeus, Greece-that m a y present an identification challenge for gemologists. The fine...manufactures synthetic crystals. A physicist and an electrical engineer, respectively, they previously...DeMaggio. rn rn two new surfaces produced when an irregular intergrowth of two rhombohedral crystals...Occasionally, they also show small, colorless "satellite" corundum crystals that have intergrown with the main crystal; |  | | Journal (issue) | | retailer.gia.edu Business words to the wise? Selling is an idea game. The more knowledge you have, the more...the Tan Huong–Truc Lau Area, Yen Bai Province, Northern Vietnam Nguyen Ngoc Khoi, Chakkaphan Sutthirat...Although not as well known as the Luc Yen district, this area is an important source of ruby and sapphire...Infrared Spectroscopy of Natural vs. Synthetic Amethyst: An Update Stefanos Karampelas, Emmanuel Fritsch, Triantafillia...Koivula, and James E. Shigley LA-ICP-MS analysis offers an excellent means of separating meteoritic peridot |  | | Book | | Pearson, Yan Luo, Andrew J. Fagan and Chiranjeeb Sarkar An Evaluation of the Potential for Determination of...the Geographic Origin of Ruby and Sapphire Using an Expanded Trace Element Suite Plus Sr–Pb Isotope Compositions...has a BSc from Yangon University, Myanmar, in 1968, an FGA Diploma (Fellowships of Gemmological Association...New Zealand, China and many parts of SE Asia (Vietnam, Laos, Cambodia, Malaysia, Thailand, Indonesia...studies, namely ruby, the red-colored gem variety of corundum. The color results from a sufficiency of the trace |  | | Journal (issue) | | NEWTECHNIQUES Sapphires from Changle in Shandong Province, China fingfeng Guo, Fuquan Wang, and Gerry Yukoumelos...Lebanon, N{ Ray Page Santa Monica, CA George Rossn~an Pasadena, CA Kenneth Scarratt London, United Kingdom...either by control of the new source or by access to an important market segment, can assign a name of their...in the 1970s. We at Gems o)Gemology have supported an author's right to use a term that has a reasonable...misleading. Attempting to establish the makeup of an all-powerful nomenclature board to serve the gemological |  | | Journal (issue) | | 90 Play-of-Color Opal from Wegel Tena, Wollo Province, Ethiopia Benjamin Rondeau, Emmanuel Fritsch,...Donors Lab Notes Unusual polyphase inclusions in corundum • Black diamond with solid CO2 micro-inclusions...Update on ruby, sapphire, and spinel mining in Vietnam • Sphene from northern Pakistan • Spinel from Bawma...as a speaker or a poster presenter, please submit an abstract no later than January 10, 2011. Guidelines...the proximity to San Diego’s historic pegmatite district, we will offer field trips to working gem mines |  | | Book | | and sale prices of important stones make this book an invaluable research tool. :---,,._-.....:: "= ""-...of a star Imprisoned in its heart. A star beheld an earthly mind In ages long ago, And fell from midnight's...Sapphires-History, idenrification, value, etc. I.Title. 3. Corundum-History, identification, value, ere. 4. Precious...composition 48 The corundum suucture 48 Crystallography of corundum 50 Twinning in corundum 52 Morphology...inclusions 97 Describjng inclusions 99 Overview of corundum inclusions I 00 Country descriptions of inclusions |  | Hou, Lin, Xiong, Fuhao, Wang, Wei, Guo, Linnan, Peng, Huijuan, Ni, Shijun, Zhang, Qiming (2019) Carboniferous-Triassic felsic igneous rocks and typical mineral deposits in the Truong Son orogenic belt, SE Asia: Implications for Paleo-Tethyan tectonic evolution and metallogeny. Ore Geology Reviews, 112. 103036 doi:10.1016/j.oregeorev.2019.103036 | Journal (article/letter/editorial) | | 1016/j.oregeorev. 2019.103036 This is a PDF file of an article that has undergone enhancements after acceptance...evolution and magmatism in each stage. Here, we propose an evolutionary model for PR the Paleo-Tethys orogeny...extends from northeastern Laos through F central Vietnam and to southeastern Laos, and forms the northern...Hou et al., 2019; Leaman et al., 2019) and provide an ideal opportunity to investigate the tectonic evolution...the TSOB has not been established in detail. O An improved understanding of the Paleo-Tethyan evolution |  | | Journal (issue) | | 1: Each of the 36 emerald samples was mounted on an aluminium stud with silver conductive paint for SEM-EDX...coloured green variety of the mineral species beryl. As an allochromatic mineral species that is colourless...incorporation into the crystal structure imparts an effect on the visible spectrum that shifts the Cr3+...can shift absorption bands and alter the colour of an emerald. In addition to Fe3+ and Mg2+ placement into...performed using an Amray (Bedford, Massachusetts) scanning electron microscope (SEM) coupled to an EDAX (Mahwah |
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