 | | Journal (issue) | | necessarily of the publishers. Cover Picture Faceted sapphire from Cyangugu district, SW Rwanda. See Investigations...range of emeralds and green beryls from Central Nigeria. Detailed work on inclusions, compositions of hosts...and a higher reading for the diamond/synthetic sapphire doublet. The higher meter reading for paste results...Is the higher reading for the diamond/synthetic sapphire doublet due to deterioration of the adhesive?...Synthetic spinel Garnet Chrysoberyl Sapphire Synthetic sapphire Anglesite Scheelite YAG Carat weight |  | | Journal (issue) | | .......................................... 39 Nigeria.................................................. Israel; Tom Cushman, Madagascar; Linus Adie, Nigeria; Bill Larson, USA; Veronica Shkarina, Moscow, Russia;...recognized for its bright colors and good stability. Sapphire N ew South Wales: Production is at its lowest...is the only miner operating on the Gloucester sapphire and ruby fields, having successfully prospected...pink, a 9.00 carat deep green sapphire and a 3.50 carat bright orange sapphire. The company is marketing |  | | Journal (issue) | | 1990,22,4 J. 22,4 Gemstone prospects in Central Nigeria J. Kanis* Kanis* and J. andR.R. R.R. Harding**...mining activities activities in central central Nigeria Nigeria are briefly described.Aquamarine Aquamarine...discoveries discoveries in in Central Central Nigeria Nigeria reached reached the outside of the the eighties...world and and by by the the middle middle of Nigeria of Nigeria had had become become an an important important...aquamarine, topaz, tourmaline tourmaline and and sapphire. A A few articles about about Nigerian Nigerian |  | | Journal (article/letter/editorial) | | horizon. Gerhard Louw photo. Figure 2. Map of Nigeria showing the Egbe district (blue) in the northwest...district, the type locality of ferronigerite-2N1S. The Jos Plateau is located primarily in the Plateau district...University of Johannesburg. Egbe District Kogi State, Nigeria NIGERITE, an oxide of aluminum, iron, zinc, and...the Egbe district (formerly Kabba Province) in Nigeria (fig. 2) (Jacobson and Webb 1947; Bannister, Hey...with stanniferous pegmatites and was named after Nigeria, the country of its discovery, not to be confused |  | | Journal (article/letter/editorial) | | albitites of the Jos Plateau and from near Korot, and excellent gem zircon associated with sapphire is mined...mined at Antan, Kaduna, Nigeria. Beautifully limpid, orange-red faceting rough is currently available from...Alluvial zircon of reddish color, recovered with gem sapphire mined in the Anakie Field, Queensland, has been...zircon of gem quality and associated locally with sapphire has been found in various localities in the New |  | | Book | | George Obaje Geology and Mineral Resources of Nigeria 123 Prof. Nuhu George Obaje Nasarawa State University...University Dept. Geology & Mining Keffi Nigeria nobaje@yahoo.com ISSN 0930-0317 ISBN 978-3-540-92684-9...Resources of Nigeria are very few and mostly not accessible in Libraries and Bookshops in Nigeria. This book...activities in the Geology and Mineral Resources of Nigeria. The author has brought together several published...students of geology in tertiary institutions in Nigeria and abroad. Additional insights were also provided |  | Peucat, J.J., Ruffault, P., Fritsch, E., Bouhnik-Le Coz, M., Simonet, C., Lasnier, B. (2007) Ga/Mg ratio as a new geochemical tool to differentiate magmatic from metamorphic blue sapphires. Lithos, 98 (1) 261-274 doi:10.1016/j.lithos.2007.05.001 | Journal (article/letter/editorial) | | al. / Lithos 98 (2007) 261â274 Magmatic blue sapphire from alkali basalts 1 â Pailin (Cambodia) 2 â...Hainan 6 â Fudjian 7 â Shandong (China) 8 â Jos Plateau (Nigeria) 9 â Analafady (N Madagascar) 10 â Lake...al. / Lithos 98 (2007) 261â274 Magmatic blue sapphire from alkali basalts 1 â Pailin (Cambodia) 1.4...6 â Fudjian 1.0 7 â Shandong (China) 8 â Jos Plateau (Nigeria) b.d.l. 9 â Analafady 1.0 (N Madagascar)...98 (2007) 261â274 Fig. 1. Location of the blue sapphire deposits sampled for this study (numbered localities |  | | Journal (article/letter/editorial) | | overshadowed by diamond and the "big three" (emerald, sapphire, and ruby), topaz is nevertheless regarded as...addition to true topaz, included citrine, yellow sapphire, zircon, and even garnet. Hoover (1992) states...Katlang, Pakistan; 13. Tin granites of Jos plateau district, Nigeria; 14. Namibia pegmatites; 15. Mozambique...Tauridan topaz Rose topaz Fallow topaz Brazilian sapphire Siberian aquamarine Brazilian aquamarine Saxon...overshadowed by diamond and the "big three" (emerald, sapphire, and ruby), topaz is nevertheless an important |  | | Journal (issue) | | specimen Star Ruby and a magnificent deep blue Star Sapphire. A section of the Exhibition. 2 Her Majesty...display its stars. The stones included a 12-ray sapphire, a cat's-eye, garnet andâa neat piece of workmanshipâa...Peridot. F I G . 6. Scale of Phlogopite in a Ceylon Sapphire. 75 x 7. A xenomorphous flake of mica in a Siberian...enclosing rod-like foreign minerals, in a Ceylon Sapphire. 100 x F I G . 11. Cluster of Pyrites in Emerald...I G . 15. Rounded grains of garnet in a Ceylon Sapphire. 125 x F I G . 16. Diopside and zircon crystals |  | | Journal (issue) | | blue spots", here probably referring to the many sapphire crystals in Ceylon gravels that display pigmentation...Sri Lankan alluvial gemstone than the ruby or sapphire. The corundum crystals of these gravels commonly...1801). Thus, on on corundum, or "oriental sapphire", sapphire'~ Klaproth disputes Bergman's analysis, in...gravities, but but giving credit to CORUNDUM c(OOOI) SAPPHIRE RUBY 1200 ^=ÂŁs striated striated PINACOID...z/1l21/. 2. Sapphire and ruby crystals, the in the gem grvels of Sri Fig. 2. the sapphire at extreme left |  | Baldwin, L. C., Tomaschek, F., Ballhaus, C., Gerdes, A., Fonseca, R. O. C., Wirth, R., Geisler, T., Nagel, T. (2017) Petrogenesis of alkaline basalt-hosted sapphire megacrysts. Petrological and geochemical investigations of in situ sapphire occurrences from the Siebengebirge Volcanic Field, Germany. Contributions to Mineralogy and Petrology, 172 (6) doi:10.1007/s00410-017-1362-0 | Journal (article/letter/editorial) | | basaltâhosted sapphire megacrysts. Petrological and geochemical investigations of in situ sapphire occurrences...generally normative in corundum. Most of these sapphire occurrences are located in alluvial or eluvial...indicating chemical disequilibrium between the sapphire and the basaltic melt, supporting a xenogenetic...Columbite Group inclusion within one Siebengebirge sapphire using laser ablationâinductively coupled plasmaâmass...indicates a close genetic relationship between sapphire crystallization and alkaline mafic volcanism in |  | | Journal (issue) | | (10) 4.82-ct emerald, Colombia; (11) 8.31-ct pink sapphire, Sri Lanka; (12) 5.79-ct pink spinel, Pamir Mountains...(13) 10.15-ct pink topciz, Pakistan; (14) 6.70-ct sapphire, Kashmir, India; (1516.14-ct fancy intense yellow...B~O&B, such AS mediate blue topaz and heat-treated sapphire, \ whichwere now available in hundteds of tlittuaands...Chrysoberyl (Q I @ Corundum (Ruby) Corundum (Sapphire) Diamond <ä Garnet 0 Jade (JadeiteINephrite)...amounts of gem-quality aquamarine were found in Nigeria, Zimbabwe, Zambia (figure 4), Namibia, Madagascar |  | Aurisicchio, Carlo, Conte, Aida M., Medeghini, Laura, Ottolini, Luisa, De Vito, Caterina (2018) Major and trace element geochemistry of emerald from several deposits: Implications for genetic models and classification schemes. Ore Geology Reviews, 94. 351-366 doi:10.1016/j.oregeorev.2018.02.001 | Journal (article/letter/editorial) | | emerald occurs with ruby, chrysoberyl (BeAl2O4), sapphire, topaz, fluorite, margarite, muscovite, phenakite...rocks (Dias and Wilson, 2000). The emerald from Nigeria is the result of early metasomatic albitization...albitization of alkaline granite of the Mesozoic Jos ring complex (Vapnik and Moroz, 2000). Emerald along with quartz...usually in the order Mg>Fe>Cr, 10 except for Nigeria Jos samples where Fe is higher than Mg and Cr. Moreover...apfu to â substituents = 1 apfu. Samples from Nigeria and Tanzania with Al next to 2 apfu, and Brazil |  | | Journal (article/letter/editorial) | | Color Zonation and Chemical Composition of Penglai Sapphire in Hainan Province, China Guang-Ya Wang 1,2 ,...(LAâICPâ MS). The results show that the Penglai sapphire has a magmatic origin, mostly showing various...in rims is higher than in cores of color-banded sapphire, which results from ubiquitous Ti-bearing inclusions...sapphires. Sapphire in Hainan Province, China. Minerals 2022, 12, 832. https:// Keywords: sapphire; color...Introduction Gem-grade corundum is also known as sapphire and ruby. As a variant of natural Îą-Al2 O3 , corundum |  | | Journal (article/letter/editorial) | | parental melt. Salic xenoliths containing corundum (sapphire) are now known from four of the ďŹve tectonic terranes...and U (Upton et al., 1999). Recently discovered sapphire-bearing anorthoclasites from a dyke at Fionnphort...resorption and regrowth features in some of the sapphire crystals testify to dynamic crystallization environments...latter being ďŹagged by the presence of corundum (sapphire). Because of their economic importance elsewhere...associations. The association of zircon, corundum (sapphire) plus alkali feldspar megacrysts and continental |  | | Journal (article/letter/editorial) | | Bulgaria, China, India, Madagascar, Namibia, Nigeria, Pakistan, South Africa, Spain, Tanzania, the United...emerald occurs with ruby, chrysoberyl (BeAl2O4), sapphire, topaz, ďŹuorite, margarite, muscovite, and quartz...NiO; 101, 0.10 wt.% CoO, 0.43 wt.% NiO. 103. Nigeria, Jos (Gavrilenko et al., 2006). 104-105. Norway,...°C and pressures of 3 to 4 kbar. 5.14. Nigeria In central Nigeria emerald occurs as a result of early metasomatic...albitization of an alkaline granite of the Mesozoic Jos ring complex (Vapnik and Moroz, 2000). The emeralds |  | KANOUO, Nguo Sylvestre, ZAW, Khin, YONGUE, Rose Fouateu, SUTHERLAND, Frederick Lin, MEFFRE, Sebastien, NJONFANG, Emmanuel, MA, Changqian, TCHOUATCHA, Milan Stafford (2012) U-Pb Zircon Age Constraining the Source and Provenance of Gem-Bearing Late Cenozoic Detrital Deposits, Mamfe Basin, SW Cameroon. Resource Geology, 62 (3) 316-324 doi:10.1111/j.1751-3928.2012.00197.x | Journal (article/letter/editorial) | | petrographic studies revealed the presence of sapphire, ruby and diamond in Nsanaragati (Laplaine & Soba...Dumort, 1968). The Mamfe basin is part of the NigeriaâCameroon Mesozoic rift system (Benue trough), with...tourmaline, kyanite, hematite, topaz, and corundum (sapphire and ruby). Figures 3 and 4 give the quantitative...of the Mamfe formation, Mamfe Basin, southeast Nigeria and southwest Cameroon. Ann. Fac. Sci., 117â130...and evolution of the Cretaceous Benue Trough (Nigeria). J. Afr. Earth. Sci., 8, 251â282. Berthois, L |  | | Journal (issue) | | Argyle, courtesy of Rio Tinto; (4) an 11.16 ct sapphire from Madagascar, GIA Collection no. 31618; (5)...fields. Likewise, beryllium diffusion of ruby and sapphire brought together geologists, gemologists, and...exports from Myanmar disrupted supply channels for sapphire and ruby. And the proliferation of new sales avenues...Consulting, 2009). Broken down further, ruby and sapphire accounted for 30% ($3 billion) and emerald 12%...market for much of this decade. The orange-pink sapphire in the ring weighs 3.15 ct; the loose stones are |  | | Journal (issue) | | (7) 2.14 ct blue sapphire, (8) 23.18 ct blue spinel, (9) 4.82 ct purple sapphire, (10) 5.32 ct ParaĂba...1.15 ct purplepink sapphire, (16) 5.54 ct spessartine, (17) 8.04 ct orange sapphire, and (18) 3.48 ct...and Vietnam), Africa (Tanzania, Kenya, Zimbabwe, Nigeria, and Namibia, as well as Madagascar), South America...from southern Tanzania; spessartine garnet from Nigeria and Namibia; exceptional peridot from Pakistan;...Pakistan; and pink to red tourmalines from Nigeria and Brazil. Diamond was mined in northern Canada for the first |  | | Book | | NIGERIA AND ITS TIN FIELDS TN 477 N6C34 1977 WLU 1023050B WILFRID LAURIER UNIVERSITY LIBRARY CALVERTr...CALVERTr ALBERT FREDERICK NIGERIA AND ITS TIN FIELDS TN 477 N6C34 1977 European Business Four Centuries...this volume for a complete list of titles. NIGERIA AND ITS TIN FIELDS ALBERT F. CALVERT ARNO PRESS...Publication Data Calvert, Albert Frederick, 1872-1946. Nigeria and Its tin fields. (European business) Reprint...E. Stanford, London. 1. âTin mines and miningâNigeria. I. Title. II. Series. TN477.N6C34 1977 338.2'7'45309669 |  | | Journal (issue) | | of eastern Nepal (see Fig. 2). Cabochon quality sapphire was also reported from the same district by A...presence in both stones of straight bands of blue sapphire. Two specimens of ruby in matrix were supplied...paler ruby and some sharply defined bands of blue sapphire with growth lines meeting at 120° (Fig. 6). The...minerals, and dark mica schist containing ruby and sapphire from Nepal. Fig. 5. End-on view of prismatic...Note the contrast between the zones of ruby and sapphire and the greenish-white fluorescence of the sheaf-like |  | | Journal (article/letter/editorial) | | dominant (Colombia), Mohmand (Pakistan), (Norway), (Nigeria), and PoonaLened (Australia) are the the higher...those (Colombia), (Pakistan), Eidsvoll (Norway), Jos (Nigeria), and Poona (Australia) are 3 2 3 the main exceptions...the FeO-V2 O3 edge of the plot. Clusters of Poona, Jos, and Panjshir Valley Lened, and Mohmand extend along...the FeO-V2O3 edge of the plot. Clusters of Poona, Jos, and are around the FeO corner. Clusters of Muzo...suggesting that LiClusters V-dominant deposits. of Jos fall below the 1:1 line obviously, and those of Dayakou |  | | Journal (issue) | | the use of colour charts to decide ruby, pink sapphire, green beryls of fine colour (with the desire...1982, XVIII, 2 FLUORITE INCLUSIONS IN TOPAZ FROM NIGERIA By S. HORNYTZKYJ, F.G.A. While examining colourless...colourless water-worn pebbles of topaz from Nigeria (Figure 1) under the microscope, I observed small (41/^m...FIG. 1. Part of the examined topaz pebbles from Nigeria. ISSN: 0022-1252 XVIII (2) 131 (1982) 132 J...2. Cubic fluorite inclusions in a topaz from Nigeria. (190 x ) â˘I I1;:; ^ ) FIG. 3. Octahedral fluorite |  | | Journal (issue) | | 536 Geographic Origin Determination of Blue Sapphire Aaron C. Palke, Sudarat Saeseaw, Nathan D. Renfro...Shane F. McClure In some cases, the value of a sapphire depends strongly on its geographic origin. This...details the origin data GIA has collected for blue sapphire and describes its methodology for using the data...chemical analyses to distinguish samples from Brazil, Nigeria, and Mozambique. 660 Geographic Origin Determination...left: a 64.45 mm Sri Lankan sapphire crystal, a 24.34 ct Sri Lankan blue sapphire, two cuprian tourmalines |  | | Report (issue) | | Dietmar Schwarz and Gaston Giuliani Africa: Egypt, Nigeria, Tanzania, . . . . . . . . .52 Mozambique, Zambia...their language into antiquity As with opal and sapphire, the terms beryl and emerald likely came to us...first row; the second row shall be a turquoise, a sapphire, and a diamond . . . " (Exodus 28:16-18, New King...stones: the first foundation was jasper, the second sapphire, the third chalcedony, the fourth emerald ......Azurite, the Star of India (the world's largest blue sapphire) and several impressive emeralds. The Patrizius |
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