 | Giuliani, Gaston, Fallick, Anthony, Rakotondrazafy, Michel, Ohnenstetter, Daniel, Andriamamonjy, Alfred, Ralantoarison, Théogène, Rakotosamizanany, Saholy, Razanatseheno, Marie, Offant, Yohann, Garnier, Virginie, Dunaigre, Christian, Schwarz, Dietmar, Mercier, Alain, Ratrimo, Voahangy, Ralison, Bruno (2007) Oxygen isotope systematics of gem corundum deposits in Madagascar: relevance for their geological origin. Mineralium Deposita, 42 (3) 251-270 doi:10.1007/s00126-006-0105-3 | Journal (article/letter/editorial) | | isotope systematics of gem corundum deposits in Madagascar: relevance for their geological origin Gaston...d’Antananarivo, Ambohitsaina, BP 906, Antananarivo 101, Madagascar Y. Offant Cerege, Europole Méditerranéen de l’Arbois...Ambaranjana Antanimora, Antananarivo 101, Madagascar ces in Madagascar to provide a gemstone geological identification...characterization. Primary corundum deposits in Madagascar are hosted in magmatic (syenite and alkali basalt)...karsts. The oxygen isotopic ratios (18O/16O) of ruby and sapphire from primary deposits are a good indicator |  | Giuliani, Gaston, Fallick, Anthony E., Feneyrol, Julien, Ohnenstetter, Daniel, Pardieu, Vincent, Saul, Mark (2011) 18O/16O and V/Cr ratios in gem tsavorites from the Neoproterozoic Mozambique metamorphic belt: a clue towards their origins?. Mineralium Deposita, 46 (7) 671-676 doi:10.1007/s00126-011-0355-6 | Journal (article/letter/editorial) | | from northern and southern Tanzania, Kenya, and Madagascar. Three consistent sets of δ18O values between...tsavorite deposits are found in Kenya, Tanzania, and Madagascar. The geology of the deposits has been studied...tsavorite of 4.58 carats from the Merelani mining district. Photograph from Swala gem traders (on the left...tsavorite from the Nadan I mine in the Voi mining district (Kenya). The width of the photograph is 8 cm....(Bridges 1974). The occurrences of Gogogogo and Behara in southern Madagascar (Mercier et al. 1997) as well |  | | Journal (issue) | | occurrence of vanadian grossular garnet from Madagascar A. Mercier1,2, B. Moine2, J. Delorme3 and M.A...Antananarivo, Madagascar 4 Service de Géologie, Université de Tananarive, B.P 906, Antananarivo, Madagascar ABSTRACT:...occurrence of vanadian grossular garnet from Madagascar is described. Its composition is similar to grossulars...Figure 1: The Gogogogo tsavorite occurrence Vanadian grossular garnet of gemin Madagascar. quality (tsavorite)...of 1991 in the Gogogogo area of south-western Madagascar, about 40 km north of Ampanihy (Figure 1) and |  | Feneyrol, Julien, Giuliani, Gaston, Ohnenstetter, Daniel, Rondeau, Benjamin, Fritsch, Emmanuel, Fallick, Anthony E., Ichang'i, Daniel, Omito, Edward, Rakotondrazafy, Michel, Ranatsenho, Madison, Lallier, Florent (2014) New typology and origin of tsavorite based on trace-element chemistry. European Journal of Mineralogy, 26 (2) 293-308 doi:10.1127/0935-1221/2014/0026-2367 | Journal (article/letter/editorial) | | Université d’Antananarivo, Antananarivo 101, Madagascar rre ct Abstract: New electron-microprobe analyses...of economic tsavorite from Kenya, Tanzania and Madagascar. Key-words: tsavorite, green grossular, electron...Mozambique Belt), and mined in placers from Sri Lanka, Madagascar and Tanzania (Giuliani et al., 2012). In other...economic deposits are located in Kenya, Tanzania and Madagascar but other small occurrences are known in Pakistan...Gem-quality tsavorites are found in East Africa, Madagascar and East Antarctica (Feneyrol et al., 2013). |  | Boger, S.D., Hirdes, W., Ferreira, C.A.M., Jenett, T., Dallwig, R., Fanning, C.M. (2015) The 580–520Ma Gondwana suture of Madagascar and its continuation into Antarctica and Africa. Gondwana Research, 28 (3) 1048-1060 doi:10.1016/j.gr.2014.08.017 | Journal (article/letter/editorial) | | The 580–520 Ma Gondwana suture of Madagascar and its continuation into Antarctica and Africa...Fanning, C.M., The 580–520 Ma Gondwana suture of Madagascar and its continuation into Antarctica and Africa...MANUSCRIPT The 580–520 Ma Gondwana suture of Madagascar and its PT continuation into Antarctica and...ABSTRACT SC RI U–Pb age data from southwest Madagascar provides a compelling case that the pre-Gondwana...continuity across the suture. In southwest CE Madagascar the distribution of metamorphic ages places 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) | | minerals Review Ruby Deposits: A Review and Geological Classification Gaston Giuliani 1, *, Lee A. Groat...is not uncommon on Earth but the gem varieties of ruby and sapphire are relatively rare. Gem corundum deposits...classification scheme for ruby deposits is described in the present paper. Ruby forms in mafic or felsic...geological environments are favorable for the presence of ruby: (1) amphibolite to medium pressure granulite facies...volcanism in continental rifting environments. Primary ruby deposits formed from the Archean (2.71 Ga) in Greenland |  | | Journal (article/letter/editorial) | | ev A preliminary stable isotope study on Mogok Ruby, Myanmar Tzen-Fu Yui a,⁎, Khin Zaw b, Chao-Ming...Available online 3 June 2008 Keywords: Stable isotopes Ruby Spinel Forsterite Marble Mogok Myanmar (Burma) ... A B S T R A C T The primary occurrence of ruby in the Mogok area, northern Myanmar is exclusively found...resulting most likely from fluid–rock interactions. Ruby-bearing marble and phlogopite–graphite marble follow...depletion trend with relatively constant δ13C values. Ruby formation might have resulted from CO2-rich fluid–rock |  | | Journal (issue) | | computer equipment at the schools in the Tourmalina district of Minas Gerais. The ICA contribution is part...within their industries. As an introduction to the ruby issue, Dr Adolph Peretti, director of GRS Laboratories...industry should work together to try and have the ruby ban repealed as it will cause enormous damage to...in the Mogok valley, and the possible collapse of ruby prices. It also seems unfair that the United States...the Thais who could be hurt. A great deal of the ruby cutting is done in India, he commented. There would |  | | Book | | Mineralogy and Geochemistry of Ruby Edited by Frederick Lin Sutherland and Khin Zaw Printed Edition... Mineralogy and Geochemistry of Ruby Mineralogy and Geochemistry of Ruby Editors Frederick Lin Sutherland...the Special Issue “Mineralogy and Geochemistry of Ruby” published online in the open access journal Minerals... vii Preface to ”Mineralogy and Geochemistry of Ruby” . . . . . . . . . . . . . . . . . . . . . . . ...for Special Issue “Mineralogy and Geochemistry of Ruby” Reprinted from: Minerals 2020, 10, 888, doi:10 |  | | Journal (issue) | | courtesy of Rio Tinto; (4) an 11.16 ct sapphire from Madagascar, GIA Collection no. 31618; (5) a 1.01 ct yellow...collection, courtesy of Aurora Gems; (6) a 9.15 ct ruby from Winza, Tanzania, courtesy of Hakimi & Sons;...from other fields. Likewise, beryllium diffusion of ruby and sapphire brought together geologists, gemologists...competitive rough diamond market. Political problems in Madagascar and a ban on gem exports from Myanmar disrupted...disrupted supply channels for sapphire and ruby. And the proliferation of new sales avenues, through the Internet |  | | Journal (issue) | | ct emerald, (13) 1.99 ct red beryl, (14) 0.72 ct ruby, (15) 1.15 ct purplepink sapphire, (16) 5.54 ct...Kenya, Zimbabwe, Nigeria, and Namibia, as well as Madagascar), South America (Brazil and Colombia), central...These included ruby from Mong Hsu, Myanmar (Burma); blue and pink sapphires from Madagascar; a wide variety...other beryls, alexandrite and other chrysoberyls, ruby and sapphire, diamond, garnet, jade [both jadeite...small stones (0.05 to 1 ct) of high quality. Madagascar and Zambia tend to produce cleaner but slightly |  | | Journal (issue) | | E A T B R I T A I N Vol. VI No. 3 JULY 1957 RUBY AND SAPPHIRE by ROBERT WEBSTER, F.G.A. I T is...often difficult for the uninitiated to realize that ruby, with its red colour, a n d the blue sapphire are...form of the same mineral is abrasive emery. Both ruby a n d sapphire have been coveted as gems over the...legend a n d lore of ruby a n d sapphire are quaint. T h e lucky owner of a fine ruby was said to be assured...e high esteem placed on ruby is further indicated by the names applied to ruby in Sanskrit. These were |  | | Thesis/Dissertation | | ............. 22 2.5.3.1.2.5. Antetezambato, Madagascar ........................................................................... 27 2.5.4.1.1.3. Madagascar ................................................................... 40 2.5.9.1.1.2. Bekily, Madagascar ........................................................................... 42 2.5.9.2.2.2. Madagascar ................................................................. 42 2.5.9.2.2.3. Tranoroa, Madagascar............................................. |  | | Journal (issue) | | resembles greenish-blue aquamarine from Tongafeno (Madagascar) but also contains three-phase inclusions like...two papers reflect the growing importance of Madagascar and describe features of sapphires from a new...ornamental greenish rock containing variable amounts of ruby and sapphire. However, this was not the source for...looked very similar to aquamarine from Tongafeno, Madagascar (Figure l), 1 but which had different physical... 6 Apart from the aquamarine from Tongafeno, Madagascar, which it resembles in appearance, there are |  | | Journal (issue) | | 32 NO. 2 T A B L C O N T E N T S EDITORIAL Madagascar: Making Its Mark Richard T. Liddicoat FEATURE...ARTICLES Sapphires from the Andranondambo Region, Madagascar Dietmar Schwarz, Eclzehard I. Petsch, and Tan...new find of gem blue sapphires on the island of Madagascar. Over the years, we have come to think of Sri...Sri Lanlza as the gem island, but Madagascar certainly vies with it in the variety of fine-quality gem...this volume refers to Sri Lanlza 28 times and to Madagascar, 24 times. Both islands are underlain by ancient |  | | Journal (issue) | | Iran|Purple apatite from Namibia|Cordierite from Madagascar|Emerald and pyrite mixture from Colombia|Garnet...Colombia|Garnet from Mahenge, Tanzania|Grandidierite from Madagascar|Lalique quartz pendant in polarized light|Faceted...from Inner Mongolia|Sphalerite inclusions in quartz|Ruby from Liberia|Unstable yellow colour in sapphire|Petroleum...low-temperature treatment) and Madagascar (Andilamena); sapphires from Madagascar (Andranondambo), Nigeria...diffusion-treated spinel; a challenging Ramaura synthetic ruby; natu- What’s New ral diamonds found in a parcel |  | | Journal (issue) | | emmoi emmoi emmoi Volume 27 No. 7 July 2001 Madagascar gems • Type II diamonds • Describing gems he... New gemstone occurrences in the south-west of Madagascar Dr Claudio C. Milisenda1, Dr Ulrich Henn2 and...were discovered in the south-western part of Madagascar. The secondary deposits extend from the south...geological environment of the new deposits in Madagascar is similar to the alluvial deposits of Sri Lanka...properties, geology, internal characteristics, Madagascar, padparadscha, sapphire Introduction M adagascar |  | | Journal (issue) | | ? HyS 128 129 131 129 141 144 130 Corundum: ruby, blue sapphire and other colours Verneuil flame...other melt methods. 1885 Ruby (SP) (see Figure 3) 'Ceneva'ASwitzerland?) 1902 Ruby (see Figure 4) AVL Verneuil/Société...Hellerite/France Hoquiam/USA 1903 Ruby (SP) 1907 Blue sapphire Verneuil/Baikovsky/France 1942 Ruby L Merker/Linde/USA...corundum Linde/USA Linde/USA 1960 Ruby discs (SP) FR Charvat/Linde/USA 1965 Ruby H LaBelle/Tyco/USA 1971 Sapphire...colourless tubes, etc. Bijoreve/Seiko/Japan 1983 Ruby, etc. (NC) Union Carbide/USA and others 1990 Pink |  | | Journal (issue) | | p.BCr1 GIA G&G Spring ʻ11 Journal #20183-0 Madagascar Demantoid Andesine and Zircon from China Vietnamese...Demantoid and Topazolite from Antetezambato, Northern Madagascar: Review and New Data Federico Pezzotta, Ilaria...northeastern China. 42 Aquamarine from the Thuong Xuan District, Thanh Hoa Province, Vietnam Le Thi-Thu Huong... imitating emerald • Lead glass–filled trapiche ruby • Myanmar Gem Emporium • Kurt Nassau (1927–2010)...near the village of Antetezambato, in northern Madagascar, emerged as an important source of demantoid |  | | Journal (issue) | | value and demand of the gem varieties of corundum (ruby, sapphire) as well as beryl (emerald, aquamarine)...synthetic emerald (part 2) as well as as in sapphire, ruby, amethyst and citrine (part 3). These structural...variation of interference 6, 7, 8. figures of a natural ruby from Burma during a slight rotation of the stone;...use for the distinction of natural and synthetic ruby as well as natural and synthetic amethyst consult...use in the distinction of natural and synthetic ruby as well as natural and synthetic amethyst. J. J |  | | Journal (issue) | | EIGHT OCTOBER 1991 Cover Picture Cross section of ruby crystal with massive rutile inclusion. (Plate 5...is it just a question of vs. Verneuil synthetic ruby. Today we face natural vs. the possibility of having...determine, for ISSN: 0022-1252 460 example, that a ruby is natural, we may then have to determine whether...of price. And the King of this Island possesses a ruby which is the finest and biggest in the world; I...a favour greatly desired by him to sell him this ruby, offering to give for it the ransom of the city |  | | Book (edition) | | Ratanakiri Zircon 204 Rhodolite 210 Rubellite 216 Ruby 224 Russian Diopside 232 Spessartite 238 Tanzanite...in nature that may be eye-visible, for example Ruby. ¢ Type III: These gems typically grow with many...value in the marketplace and Diamond, vice versa. Ruby and Sapphire. When other Beauty, marketing ...colour centres), Sapphires would be colourless. Ruby, the ‘king ofgems’ all Most things get their colour...Pyrope Rhodonite Rose de France Amethyst Ruby Star Ruby oO mm. Rose Quartz Rubellite te, Pezzottaite |  | | Journal (issue) | | the Ndola Rural Protected Area of the Lufwanyama district in the Copperbelt Province of Zambia. The Ndola...2002. The Santa Terezinha-Campos Verdes emerald district, central Brazil: structural and Sm-Nd data to...spinels are known from Tanzania, Sri Lanka and Madagascar (e.g. see Modern Jeweler). The gem-quality spinels...Myanmar (Mogok and Namya), Vietnam (Luc Yen area), Madagascar (Ilakaka region), Tajikistan (Pamir Mountains:...Chay River runs (NNW-SSE) through the Luc Yen district; primary and secondary deposits of gem quality |  | | Book | | Neuerdings sollen größere Rubinfunde in der Gegend von Gogogogo im Süden Madagaskars gemacht worden sein (Behier...& Story, M.S. (1966): Growth of Broad Linewidth Ruby Crystals. J. Appl. Phys. 37: 832-836. Altherr, R...Gemmol. Ges. 26: 118-127. Anonym (1966): Hydrothermal ruby. - J.Gemm. 10: 96-98. Arlett, R. H., Robbins, M...Mineralogie de Madagascar. - Ann. Geol. de Madagascar 29: 1-78. Belt, R. F. (1967): Hydrothermal Ruby: lnfrared...Mining Methods and Economic Potential of the Pailin Ruby and Sapphire Gem-field, Khmer Republic. - Inst. |  | | Book (edition) | | 4 5 6 7 8 9 10 11 12 13 14 Diamond I Diamond II Ruby and Sapphire Beryl Chrysoberyl Spinel Topaz Tourmaline...extensive fields in the prophetically named Kimberley district of Western Australia promise to be of world importance...with modern knowledge. In the cases of emerald and ruby and sapphire new sources of supply have necessitated...incorporation in this work of my articles on emerald, ruby and sapphire, and marble, as well as a number of...may be how ruby and spinel formed in 21 The Geological Sources of Gems Figure 1.20 Ruby crystals and |
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