 | | Book | | MINERALS& GEMSTONES of East Africa Burundi, Kenya, Rwanda, Tanzania and Uganda Bruce Cairncross Published...Africa 10 East African resources 12 Burundi 13 Kenya 14 Rwanda 16 Tanzania 17 Uganda 20 Gemological properties...through Tanzania, Kenya, Ethiopia and into the Sudan - has blessed East Africa, Kenya and Tanzania, with...now mainland Tanzania) and then progressing to Kenya - I am proud to say that the coloured gemstones...fact is that both of the national gemstones of Kenya and Tanzania (tsavorite and tanzanite, respectively) |  | | Journal (issue) | | manganese and vanadium. Keywords: absorption sapphire, XRF analysis spectra, hydrothermal, Russia...to grow the direct counterparts of natural blue sapphire doped with iron and titanium (Thomas et ah, 1997)...diagnostic features can be summarized. synthetic sapphire was also examined. In order to characterize the...synthetic sapphires, samples and properties Type of sapphire Cause of colour Pleochroism He | bluish-violet...type bluishviolet sapphire nat: basaltic type yellow sapphire imit: green sapphire imit: ! padparadscha |  | | Book | | noted gemologist and geologist, Dr. Peter Keller. Kenya and Tanzania are revealed in their full mineralogical...of the 'Irelawney Collection of the Los Angeles County Museum of Natural History. ♦ Figures vii Foreword...Properties 23 Important Gems 23 Chapter 3. Ruby and Sapphire Deposits of East Africa 27 Ruby From Longido,...Tanzania 28 Ruby and Sapphire from Umba, Tanga Province, Tanzania 32 Sapphire from Kenya 42 Ruby from Mangari...Mangari, Tsavo West National Park, Kenya 44 Chapter 4. Emerald and Alexandrite from Tanzania 49 Location |  | Jacob, J.-B., Martelat, J.-E., Goncalves, P., Giuliani, G., Devidal, J.-L., Feneyrol, J., Omito, E., Ichang'I, D. (2018) New P-T-X conditions for the formation of gem tsavorite garnet in the Voi area (southwestern Kenya) Lithos, 320. 250-264 doi:10.1016/j.lithos.2018.09.010 | Journal (article/letter/editorial) | | formation of gem tsavorite garnet in the Voi area (southwestern Kenya) J.-B. Jacob, J.-E. Martelat, P. Goncalves...formation of gem tsavorite garnet in the Voi area (southwestern Kenya). Lithos (2018), doi:10.1016/ j.lithos...formation of gem tsavorite garnet in the Voi area (southwestern Kenya) J-B. Jacoba,*, J-E. Martelata,**, P...Mines and Geology Department Taita-Taveta, P.O. Box 1043-80304, Wundanyi, Kenya h M Department of Geology...Riverside drive, P.O. Box 30197-00100 GPO, Nairobi, Kenya  Principal corresponding author ED *Corresponding |  | | Book | | RESOURCES OF KENYA By WILLIAM PULFREY. M.Sc., Ph.D., F.G .. , Assoc.Inst.M.M. Sniior Geolo!list, Kenya Colony...RESOURCES OF KENYA By WILLIAM PULFREY, M.Sc., Ph.D., F.G.S., Assoc.lnst.M.M . . Senior Geologist, Kenya Colony...282 283 283 284 285 Production of Minerals in Kenya Gold and Silver . Soda Products Other Minerals of... 289 p. 289 II. Simplified Geological Map of Kenya ( In pocket) Mineral Map of.Kenya ( Map Showing...Geologically Surveyed by Official Geologists in Kenya ) ...-,.; THE GEOLOGY AND MINERAL RESOURCES |  | | Journal (issue) | | temperature range 1800-1850°C turned it into a dark blue sapphire (Figure 3). ISSN: 0022-1252 404 J. Gemm., 1989...this was the effect of Devanampiya Tissa's merit. Sapphire, beryl, ruby, these gems and many jewels and those...the wheel. A sort of emery or finely powdered sapphire of coarse quality, moistened with water, is the...precious stones but found scarcely a good ruby or sapphire among them. Streeter of London and the great New...experienced lapidary can say that a particular good blue sapphire is from the Rakwana (south central of Sri Lanka) |  | | Journal (issue) | | ........................................... 32 Kenya ..................................................Durlabjhi, Jaipur, India; Susie Kennedy, Nairobi, Kenya; Udi Harel, Israel; Tom Cushman, Madagascar; Linus...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 |  | | Catalog/List | | Corundum, the starting material for such lovelies as: Sapphire and Ruby, can be found in a wide range of forms...the crystal is rotated while lit from behind; Sapphire blue and reddish purple are two of the three Tanzanite...level of recognition accorded to ‘old-line’ gems: Sapphire, Emerald, Diamond, etc. The map, on the opposite...Tiffany’s in honor of Tsavo East National Park in Kenya; it is a completely natural stone – there are no...- 11.06 Ct. Voi, Taita Taveta District, Coast Province, Kenya Tsavo National Park in Kenya has benefited |  | 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) | | uncommon on Earth but the gem varieties of ruby and sapphire are relatively rare. Gem corundum deposits are...Vohitany; Ejeda). Ethiopia: (5) Kibre mengist, Dilla. Kenya: (6) West Pokot; (7) Baringo; (8) Kitui; Gogogogo;...Vohitany; Ejeda). Ethiopia: (5) Kibre mengist, Dilla. Kenya: (6) West Pokot; (7) Baringo; (8) (9) Kitui; Mangare...and theand Rockland (former John Saul) mine in Kenya stopped producing. Africa (Figure 4) gem rubies...John Saul) mine in Kenya stop ucing. In Africa (Figure 4) gem rubies are mined in Kenya (Mangare and Baringo) |  | | Journal (issue) | | Pakistan and Vietnam|Bicoloured grossular from Kenya|Jade-like materials sold in Myanmar|Blue kyanite...(including alexandrite), corundum (ruby, blue sapphire and synthetic colour-change corundum), diamond...gia.edu/gia-news-researchnigerian-source-blue-sapphire. Goldsmiths’ Review 2013/2014 In July 2014, The...Kambanga, Kenya Light yellow-green grossular from Kambanga, Taita-Taveta District, Voi, Kenya, is notable...grossulars (0.61 and 0.42 ct) are from Kambanga, Kenya. Photo by Dirk van der Marel. The darker parts |  | | Journal (issue) | | discovered a second deposit across the border in Kenya, near Tsavo National Park. The Kenyan government’s...1992). A gem rush soon ensued and the nearby town of Voi quickly transformed into an active gem-trading center...Gladwell, the daughter of the Baraka mine owner in Kenya, used in the trade and in this article refer to...along with rough and faceted gems from Tsavo area, Kenya. Stones courtesy: Genson Micheni Musa/ Tsavolite...potential. Tsavorite is commercially mined in Tanzania, Kenya and Madagascar, mainly from deposits located along |  | | Journal (issue) | | Instrumentale, 6, 127. 385 RED DRAVITE FROM KENYA By PETE J. DUNN, M.A., F.G.A., JOEL E. AREM, Ph...the authors (J.S.) at Osarara, Narok District, Kenya. The deposit is located at 1° 34' S, 35° 46' E,...Turmaline mit hoher Licht- und Doppelbrechung aus Kenya. Z. Dt. Gemmol. Ges., 23, 2, 89-92. Frondel, C....Vanadium-Grossular von Lualenyi bei Voi, Kenya. (Vanadium—grossular from Lualenyi, near Voi, Kenya). Neues Jahrb. Min...vanadium grossular garnet from Lualenyi, near Voi, Kenya. Lapidary Journal, 1975, 29, 2, 402-426.) A dark |  | | Journal (issue) | | 1981 GOLDEN YELLOW TOURMALINE OF GEM QUALITY FROM KENYA By HENRY A. HÄNNI, Ph.D., F.G.A.,* GEORGE BOSSHART...appeared in the trade, originating from Voi-Taveta area, Kenya. Although the rough material is found in...microprobe analyses of yellow tourmalines from Kenya (Voi-Taveta) TABLE 1 ~ w (:) -J ~ :>< ~ 3 .;...Table 1. The results show that the crystals from Voi-Taveta area are Mg-Al tourmalines of the dravite-uvite...CaMg3Al5((B03)3Si6018) (OH)4 golden yellow tourmaline Kenya (partial microprobe analysis)* Si02 A1203 Ti02 |  | | Journal (issue) | | N SAPPHIRE A kingdom for this gemstone ! Associated with royalty and romance, the noble sapphire is...star sapphire cluster has been found in Ratnapura, Sri Lanka. Dubbed the 'Serendipity Sapphire,' the...and show a distinctive star. The Serendipity Sapphire A F IR S T F O www.gemstone.org TH E OF M...Dr. Gamini Zoysa (right) examines the unusual sapphire cluster. R WEST AF Jewelry designer Paula Crevoshay...we received an enquiry for a significant green sapphire. After exhausting our conventional sources, we |  | | Journal (issue) | | (7) 2.14 ct blue sapphire, (8) 23.18 ct blue spinel, (9) 4.82 ct purple sapphire, (10) 5.32 ct ParaÃba...1.15 ct purplepink sapphire, (16) 5.54 ct spessartine, (17) 8.04 ct orange sapphire, and (18) 3.48 ct...(Myanmar, Thailand, and Vietnam), Africa (Tanzania, Kenya, Zimbabwe, Nigeria, and Namibia, as well as Madagascar)... alexandrite and other chrysoberyls, ruby and sapphire, diamond, garnet, jade [both jadeite and nephrite]... African sources include several localities in Kenya, Tanzania, and Madagascar. In particular, the John |  | | Journal (issue) | | kunzite, Brazil; (4) 8.14-ct grossular garnet, Kenya; (5) 16.28-ct rubellit8 tourmaline, Queen Mine,...spessartite, Ramona, San Diego County, California; ( 9 ) 10.45-ct tsavorite, Kenya; (10) 4.82-ct emerald, Colombia;...Colombia; (11) 8.31-ct pink sapphire, Sri Lanka; (12) 5.79-ct pink spinel, Pamir Mountains, USSR; (13)...(13) 10.15-ct pink topciz, Pakistan; (14) 6.70-ct sapphire, Kashmir, India; (1516.14-ct fancy intense yellow...courtesy of the Natural History Museum of Los Angeles County; 6 is courtesy o f DuQuet lewelers, Inc.; 7 is |  | | Journal (issue) | | necessarily of the publishers. Cover Picture Burmese sapphire crystal weighing 502 ct, unearthed in 1994 at...Gwebin, in Burma's Mogok Stone Tract. (See Burmese sapphire giants, p. 551) Photo by UKhinMg Win ISSN: 1355-4565...be included in the list of sapphire giants discussed in the Burmese sapphire paper. But with verified occurrences...of Korea J. Gemm., 1995,24, 8 551 Burmese sapphire giants Richard W. Hughes* and U Hla Win** * 4894...of the world's finest blue sapphires. Burmese sapphire mining is reviewed, along with some of the most |  | Ngoc Khoi, Nguyen, Hauzenberger, Christoph A., Anh Tuan, Duong, Häger, Tobias, Van Nam, Nguyen, Thuy Duong, Nguyen (2016) Mineralogy and petrology of gneiss hosted corundum deposits from the Day Nui Con Voi metamorphic range, Ailao Shan–Red River shear zone (North Vietnam) Neues Jahrbuch für Mineralogie - Abhandlungen Journal of Mineralogy and Geochemistry, 193 (2) 161-181 doi:10.1127/njma/2016/0300 | Journal (article/letter/editorial) | | gneiss hosted corundum deposits from the Day Nui Con Voi metamorphic range, Ailao Shan–Red River shear zone...migmatized gneisses and pegmatoids of the Day Nui Con Voi range, Ailao Shan–Red River shear zone, North Vietnam...garnet+biotite+plagioclase+K-feldspar+corundum. Sapphire in gneisses (type I) crystallized during regional...Key words: corundum deposit, gneiss, Day Nui Con Voi range, Ailao Shan–Red River shear zone, mineralogy...this type of corundum deposits in the Day Nui Con Voi range started in 1995 by nguyen kinH Quoc (1995) |  | | Journal (issue) | | THE COVER: Blue sapphires, such as those in this sapphire and diamond necklace and earrings, have been one...and the durability of the treated stones. The sapphire and diamond necklace (total weight of sapphires...color at the surface of colorless or light-colored sapphire. The color was found to be stable to routine cleaning...1982; Read, 1982; "New CIBJO guidelines given to sapphire description," 1983; Hughes, 1987; Ohguchi, 1983a...Bangkok dealer with the intensely colored blue sapphire rough shown on either side of the untreated material |  | | Journal (issue) | | Volume 36 / No. 8 / 2019 Sapphire Intaglio from Pompeii Chinese Synthetic Diamonds Trapiche Rubies...from Pompeii, Italy, proved to be a basaltic-type sapphire (see article on pp. 710–725 of this issue) and...ash. ARTICLES Gemmological Analysis of a Roman Sapphire Intaglio and Its Possible Origin 710 By Michael...Topics include diamond, jadeite, nephrite, ruby, sapphire, amber, emerald, coral, pearl, chalcedony, opal...diamond, inclusions in and chemical composition of sapphire, Oregon sunstone, jet, and the new berylgroup |  | | Journal (issue) | | Thailand Masaru Mizumura, Japan Alice Muthama, Kenya Pearl Ng, Hong Kong Kobi Sevdermish, Israel Captain...excited to be in Bangkok, the global hub for ruby, sapphire, spinel and more. On Day 2, after the welcome...Thailand and Judith Bridges of Bridges Tsavorite, Kenya/USA, the first woman to be presented with this award...simultaneously as a geologist at the John Saul Mine in Kenya— I was amazed by the fact that within a relatively...geographical area, it was possible to observe ruby and sapphire deposits belonging to many of the classification’s |  | | Journal (issue) | | into Green zone 2 mm into Green zone Colourless Sapphire* Colourless Zircon* Colourless synthetic Spinel*...Wales are the second largest source of commercial sapphire production in Australia. The mining district is...of Inverell and north-west of Glen Innes. The sapphire, zircon and corundum fraction is extracted from...Australian sapphire and zircon gemstones. Australian blue sapphires dominate the world sapphire market,...Glen Innes are commercially viable sources of sapphire and zircon gemstones. This mining district is |  | | Journal (issue) | | tourmalines (dravites and uvites) from East Africa (Kenya and Tanzania) have been known in the gem trade since... nd 0.17 >6 <3 calcic aluminous dravite Voi-Taveta area, Kenya2 4 yellow nd nd nd >6 <3 ... <3 calcic aluminous dravite Yellow Mine, Taita-Taveta District, Kenya6 4 yellow, green, blue green...Mine, Taita-Taveta District, Kenya6 2 yellow green, yellow pink 0.01 – 0.14 Mukongonyi, Taita-Taveta...one calcium-bearing sample (from the Yellow Mine, Kenya) had Mg-contents of ≈3 as well as Al-contents of |  | | 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...artisanal miners, such as this tsavorite miner near Voi, in Kenya, are estimated to supply some 80% of the world’s...Consulting, 2009). Broken down further, ruby and sapphire accounted for 30% ($3 billion) and emerald 12% |  | | Journal (issue) | | GAMBIA GIBRALTAR GOLD COAST HONG KONG JAMAICA KENYA LEEWARD IS. MALAYA MALTA MAURITIUS NIGERIA NORTH...Resources of Kenya. By William Pulfrey, M.Sc., Ph.D., F.G.S., Assoc. Inst. M.M., Senio,y Geologist, Kenya Colony...1947, 147, No. 3511, 651. Being manufactured in Kenya by Stafford Allen and Sons, Ltd., in conjunction...J_A/TOKI 0 6 ' BY OFFICIAL 1 GEOLOGiSTS IN KENYA 7 'AL/ND/ 1 I I I r f, V/TENG£NI . 0 ve \L...D., F.G.S., Assoc.Inst.M.M., Senior Geologist, Kenya Colony PULFREY, first records of the geology and |
|
