 | | 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...Tanzania 32 Sapphire from Kenya 42 Ruby from Mangari, Tsavo West National Park, Kenya 44 Chapter 4. Emerald...Red Dravite Tourmaline from the Narok District, Kenya 99 Uvite-Dravite Chrome Tourmaline 99 Chapter 8...Scapolite 127 Sinhalite 129 Spinel 129 Sunstone 130 Turquoise 130 Zircon 130 Appendixes Appendix A. Noteworthy |  | | 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) | | theYellow Yellow Mine Mine (Taita-Taveta (Taita-TavetaDistrict, District,Kenya) Kenya) and andother otheryellow...Rockland Kenya Ltd., POPO Box 58511, Nairobi, Kenya Rockland Kenya Ltd., Box 58511, Nairobi, Kenya e-mail:...rockmine@africaonline.co.ke ABSTRACT: a common Kenya ABSTRACT:Tourmaline Tourmalineis is a commongemstone...inthetheMangare Mangarearea area(southern (southernKenya) Kenya)is isdescribed. described.MgMgtourmaline tourmaline(dravite-uvite...deposits from southern Kenya and Tanzania are also tourmaline deposits from southern Kenya and Tanzania are |  | | Journal (issue) | | 99, 57-67. INFRA-RED REFLECTION SPECTRA OF TURQUOISE (NATURAL AND SYNTHETIC) AND ITS SUBSTITUTES By...1 reflection spectra of natural and synthetic turquoise and some of its substitutes. Resulting curves...(cm-1 x 100) 1 Infra-red reflection spectra of turquoise and its substitutes (ordinate origins of the curves...I-Synthetic turquoise 2-Natural turquoise 3-0dontolite 4-Turquoise-imitation "Vienna" 5-Turquoise-imitation...m e t h o d : —natural turquoise, from various localities —synthetic turquoise, of Gilson manufacture |  | | Journal (issue) | | ........................................... 32 Kenya ..................................................Durlabjhi, Jaipur, India; Susie Kennedy, Nairobi, Kenya; Udi Harel, Israel; Tom Cushman, Madagascar; Linus...provinces and Inner Mongolia. In Zhangjiangkou County, Hebei province, a peridot mining industry has...transparent due to their relative lack of inclusions. Turquoise T urquoise in Hubei is mostly greenish material...rich deposits of colored gemstones, including turquoise, of which the country has reserves estimated at |  | | 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 |  | | Catalog/List | | being the Copper that gives this mineral its turquoise-blue color. It normally forms delicate, fuzzy...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...the most desirable of hues happens to be a rich turquoise blue with just a touch of green. The term Indicolite...Tsavorite Garnet - 8.21 Ct. Voi, Taita Taveta District, Coast Province, Kenya There is somewhat an embarrassment |  | | Journal (article/letter/editorial) | | extinction is inclined at =45", X' turquoise blue, Z' deep turquoise blue, Microprobe analysisgaveCuO 41...(Khibina), Berdesinskiite,V2TiO5,a new mineralfrom Kenya and addi(Kovdor). Cleavages{010},{100}perfect.Brittle...hexagonalgrains up to LasambaHill, Kwale district, southof Voi, Kenya, and is found 50 rr.m.It is usuallyfound as inclusionsin...Goose Creek Quarry, Loudoun County, Virginia. The name is for the County. Type material is preserved |  | | 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) | | (Myanmar, Thailand, and Vietnam), Africa (Tanzania, Kenya, Zimbabwe, Nigeria, and Namibia, as well as Madagascar)...rhodonite, scapolite, sphene, spodumene, sugilite, turquoise, and zircon), as well as for regions important... African sources include several localities in Kenya, Tanzania, and Madagascar. In particular, the John...John Saul mine in GEMS & GEMOLOGY Winter 2000 Kenya began producing large quantities of (mostly cabochon-grade)...production from traditional tsavorite localities in Kenya and northern Tanzania (H. Krupp, pers. comm., 1999) |  | | 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;...courtesy of the Natural History Museum of Los Angeles County; 6 is courtesy o f DuQuet lewelers, Inc.; 7 is...lago Trelawney Gem Collection at the Los Angeles County .Museum of Natural Hisory; photo 0 Harold es) Erica...of new occurrences in East Africa, specifically Kenya, Tanzania, and, more recently, Malawi (figure6) |  | | Journal (issue) | | Thailand Masaru Mizumura, Japan Alice Muthama, Kenya Pearl Ng, Hong Kong Kobi Sevdermish, Israel Captain...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...prospects for garnets in the Kuranze area of southern Kenya. Caption for opening image spread: Figure 5 – A...tsavorite miners in a remote area of Turkana County, northern Kenya. This mine is at a very early stage of |  | | Journal (issue) | | jewelry designers Susan Wheeler, Jessica Hudson, and Kenya-based artisanal mining advocate Monica Gichuhi to...artisanal miners working in Malawi, Zambia, and Kenya. The platform also features four gem cutters based...retail with the opening of two stores in Bergen County in New Jersey. And, the move paid off. The first...species but often remains out of the spotlight. Kenya and Tanzania are the major source of tsavorite garnets;...and undisclosed gem production has increased. Kenya Kenya has had a long history of mining, with significant |  | | Journal (issue) | | only low intensities were measured, whereas the turquoise areas clearly show aragonite intensities (i.e...to the pearl’s centre consists of aragonite (turquoise coloured area in Figure 8b). In Figure 8c the...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 |  | | Journal (issue) | | Pakistan and Vietnam|Bicoloured grossular from Kenya|Jade-like materials sold in Myanmar|Blue kyanite...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...of trace elements in bicoloured grossular from Kenya, measured by EDXRF.a Oxide (wt.%) Medium green...similar to the ratio in tsavorite from Baraka, Kenya. Also the FTIR spectra, with a main peak at 3598 |  | | Journal (issue) | | artisanal miners, such as this tsavorite miner near Voi, in Kenya, are estimated to supply some 80% of the world’s...not treated, such as this 3.47 ct tsavorite from Kenya, were in high demand throughout the decade. Courtesy...been linked to the 1998 U.S. Embassy bombings in Kenya and Tanzania—had sold tanzanite to fund terrorism...demantoid (figure 6). The Taita-Taveta region of Kenya (Coast Province, near Voi) produced colorchange garnets...Winza [figure 11], as well as previous deposits), Kenya (John Saul mine and a new deposit at Baringo), India |  | | Journal (article/letter/editorial) | | prior, seeking their most precious of all stones, turquoise. Deposits at Jarilla, Hachita, Mount Chalchihoitl...hunters’ attention was drawn to a light blue stone: turquoise. This mineral-the color of the sky-came to be...1915; Northrop 1959). Moreoever, in seeking turquoise (and perhaps azurite and malachite for pigments)...literature (see Northrop 1959, p. 525, for example), turquoise was initially found at Santa Rita in some abundance...“Legal Tender” just west of the present-day Grant County Courthouse. The rapid influx of miners and subsequent |  | | Journal (article/letter/editorial) | | ferrothorite (11th List). [M.A. 8-302.] Ferri-turquoise. E. E. Fairbanks, 1942. The Mineralogist, Portland...Oregon, vol. 10, p. 44. A variety of crystallized turquoise containing Fe20 s 5 %, from Lynch, Virginia. [M...Strese and U. Hofmann, 1941. [Zeits. Anorg. Chem., voI. 247, p. 65.] U. Hofmann and A. Hausdorf, Zeit~....Robertsonite). Colloidal zinc sulphide from Cherokee County, Kansas. Named after James D. Robertson, who described...Manganese-sieklerite, (Li, Mn",Fe")po~. Ferr/-turquoise, var. turquoise. Clinobarrandite, (Al,Fe)PO4.211tO. Sterrettite |  | | Journal (issue) | | naturally or in the laboratory. Dyed jade, synthetic turquoise, heat-treated beryl and zircon, irradiated spodumene...laboratory. Included in the discussion are jade, turquoise, beryl, zircon, spodumene, and topaz, as well...'1 ~ e ~ ' JADE I TE Figure 4 . Synthetic turquoise cabochon. WAVELENGTH (MICRONS) 400 600 000...side of the transmission band at 520 nm. TURQUOISE Turquoise [ C U A ~ ~ ( P O J ~ ( O5HgO] H ) ~ is blue...other natural materials may be made to look like turquoise by the addition of an appropriate dye, it is easy |  | | Journal (issue) | | mineralogy at the Natural History Museum of Los Angeles County, Los Angeles, California; and Dr. Krupp is a physicist...West Germany, and has made more than 60 trips to Kenya and Tanzania to purchase gem rough. Acknowledgments:...Campbell R. Bridges, of Bridges Exploration (Nairobi, Kenya), for helpful comments on the manuscript and for...mining has been based in an area to the south of the Taita Hills Notes and New Techniques tsavorite crystals...Photo f3 Harold &> Erica Van Pelt. in neighboring Kenya known as the TaitaITaveta district (figure 5).According |  | | Journal (article/letter/editorial) | | Coniparatce. Mosqllz, I El 1, fol. 835, --Essai sur la Turquoise e t sur la Calaite. Moscou, 1816, 8 v O . 8 3...) General Zoology; continued by J. F. Stephens, voi. 9 and 10. London, 1815-17, 8vo. 894. Sinclair (G...American Academy of Arts and Sciences, vol. 2, part 2.-voI. 4, part 1. Charlestown and Cambridge, 1804-1818 |  | | Journal (issue) | | Pinctada maxima Identification of Resin-Filled Turquoise Spinel Inclusions Chart Spring 2021 VOLUME 57...Pinctada maxima, Identification of Resin-Filled Turquoise, Spinel Inclusions Chart, and More... Duncan Pay...Evolution and Identification of Resin-Filled Turquoise Ling Liu, Mingxing Yang, Yan Li, Jingru Di, Ruoxi...Provides criteria for detecting the resin filling of turquoise, an advanced treatment that reduces porosity and...Pinctada maxima, Identification of Resin-Filled Turquoise, Spinel Inclusions Chart, and More…… Spring ushers |  | | Journal (issue) | | natural-color black cultured pearls • Identification of turquoise with diffuse reflectance IR spectroscopy 350...world-famous Pala pegmatite district in San Diego County will take place August 25, 2006. No more than 50...on green grossular garnet (tsavorite) deposit in Kenya 1969 Publishes Edelsteine, translated in 1975 as...Gübelin, 1964–1965, 1965, 1966c, 1978); the ancient turquoise mines of Iran (see, e.g., Gübelin, 1966a,b); the...(Gübelin and Weibel, 1976); the tsavorite mines in Kenya (Gübelin, 1975; Gübelin and Weibel, 1975); the emerald |  | | Journal (issue) | | gemologist, is associate director of the Los Angeles County Museum of Natural History, Los Angeles, CA; and...Pink Color center(s) inTugtupite volving sulphur Turquoise Blue Cuz* in octahedral coordination CrJ* in octahedral...electron spin resonance and optical study of turquoise. Ainericcin Mineralogist, Vol. 56, pp. 773-781...1983-2009. Edson G.M. (1980) The Red Cloud mine, Yuma County, Arizona. Mineralogical Record, Vol. 11, No. 3...(1975)Green vanadiumgrossulargarnet from Lualenyi, near Voi, Kenya. Lapidary Journal, Vol. 29, pp. 402-426. Giinawardene |  | | Journal (issue) | | 1988,21,2 74 and coral, coral, Observations on turquoise, lapis-lazuli and and some of their simulants...stimulants and of turquoise, lapis-lazuli and Gilson simulants of imitations of turquoise, lapis-lazuli and...fluorescence (XRF) analysis diffraction The imitation turquoise, lapis lazuli and coral on Gilson simulants and...compared with those resulting from the natural turquoise, lapis-lazuli and coral imitations respecmaterials...matrix, which may be different Fig. I. 1. Gilson turquoise after F acid treatment; the obvious grains of |
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