 | | 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) |  | 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 ïȘïȘ Principal corresponding author ED *Corresponding |  | | 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 |  | | 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...Phenacite 124 Rhodonite 126 Scapolite 127 Sinhalite 129 Spinel 129 Sunstone 130 Turquoise 130 Zircon 130 Appendixes |  | 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) | | productive areas from northern and southern Tanzania, Kenya, and Madagascar. Three consistent sets of ÎŽ18O values...Mozambique metamorphic belt (NMMB) extending down from Kenya to Antarctica (Pardieu and Hughes 2008). The most...most significant tsavorite deposits are found in Kenya, Tanzania, and Madagascar. The geology of the deposits...deposits has been studied partly in the Voi region in Kenya (Pohl and Niedermayr 1978) and Merelani mines...tsavorite from the Nadan I mine in the Voi mining district (Kenya). The width of the photograph is 8 cm |  | | Catalog/List | | Estimate: $1,500-$2,500 57066 Spinel Mahenge, Morogoro Region, Tanzania Spinel is one of the lesser known...crystal emerging from one side of the big one. The Spinel is gemmy in places and the crystal is quite sharp...Africa Collection Estimate: $3,000-$5,000 57069 Spinel Mahenge, Morogoro Region, Tanzania In subduction...overlying rock pressure, resulting in the formation of Spinel and Corundum in gem deposits like Mahenge, home...partial octahedron seen here. Not your average Spinel, this one has gemmy areas that would yield deep |  | | Journal (issue) | | Ornamental button in 22 ct gold set with Burmese red spinel crystals. The crystals are approximately 8-9mm...titanium for explaining the blue colour of rutile and spinel containing silky-milky corundum after heat treatment...on the growth of vanadium grossular garnets in Kenya R.M. Key, FGA*, andP.G.Hill** *British Geological...growth of green vanadium grossular garnet in SE Kenya ascertainedthe chemistry of the host graphitic gneisses...gneisses and on metamorphic conditions in SE Kenya are preby Pohl and Neidermayr (1978) are confirmed |  | | Journal (article/letter/editorial) | | to date, such as the Kwale District, south of Voi, Kenya (Medenbach & Schmetzer 1976); the Sludyanka complex...rutile associated with schreyerite from Voi, Kwale district, Kenya. For these rutiles, the mean composition...MADAGASCAR Green Giant, Madagascar Sludyanka, Russia Voi, Kenya Namalulu, Tanzania David Bell Mine, Canada Deadhorse...Russia (Reznitsky et al. 2016); Kwale District, Kenya (Medenbach & Schmetzer 1978); Namalulu, Tanzania...Medenbach & Schmetzer (1978) on samples from Voi, Kenya; Zakrzewski et al. (1982) on samples 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) | | for gems mined from the modern-day Tajikistan (spinel), and âBohemian rubyâ was used for gems coming... with a hardness of 9 on the Mohs scale (while spinel and garnets crystallize in the cubic system and...and are softer with a hardness of 8). Unlike spinel and garnet, ruby is a dichroic mineral, which will...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 |  | | Journal (issue) | | ........................................... 32 Kenya ..................................................Durlabjhi, Jaipur, India; Susie Kennedy, Nairobi, Kenya; Udi Harel, Israel; Tom Cushman, Madagascar; Linus...most of the production is mixed with calcite. The spinel mine at Kuh-i-Lal is being operated by a skeleton...locals, the sites produce Chinese peridot and spinel. Photo: ICA. many kilograms of ruby crystals, but...provinces and Inner Mongolia. In Zhangjiangkou County, Hebei province, a peridot mining industry has |  | | Journal (issue) | | synthetic spinel at 1*73: unknown to each other, M r Paulin and the writer both used synthetic spinel as a...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....author described the rare example of gahnite or zinc spinel from Brazil. (3) A short discussion on the value |  | | Report (issue) | | 119.68(7)⊠X-ray Powder Pattern: Lasamba Hill, Kenya. 2.737 (vs), 2.874 (s), 4.075 (m), 3.381 (m), 2...11 Total 99.87 98.93 100.00 (1) Lasamba Hill, Kenya; by electron microprobe, average of six analyses...formed above 600 ⊠C and 5 kbar (Lasamba Hill, Kenya); in quartzitic schists (Olâkhon Gate Straits, Lake...pyrrhotite, chalcopyrite, pentlandite (Lasamba Hill, Kenya); rutile, eskolaite, karelianite, vuorelainenite...southeast of Lasamba Hill, Kwale district, south of Voi, Kenya. At Komolo, Tanzania. In Sweden, from the SaÌtra |  | Giuliani, Gaston, Fallick, Anthony E., Boyce, Adrian J., Pardieu, Vincent, Pham, Van Long (2017) Pink and Red Spinels In Marble: Trace Elements, Oxygen Isotopes, and Sources. The Canadian Mineralogist, 55 (4) 743-761 doi:10.3749/canmin.1700009 | Journal (article/letter/editorial) | | the main productive and historical sources of gem spinel. Three consistent sets of d18O values were found...Nepal, Kiswila and Ipanko in Tanzania, Pamreso in Kenya, Mogok in Myanmar, and An Phu in Vietnam. The variation...by combination with the O-isotope composition of spinel. The present study shows that it is possible to...and red spinel, trace elements, oxygen isotopes, geographic origin. INTRODUCTION Gem spinel belongs...belongs to the aluminous spinel subgroup A2ĂŸB3ĂŸ2O4, where A represents Mg, Fe2ĂŸ, Zn, Mn, Ni, Co, Cu, and Ge |  | | 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...white gold ring set with a remarkable 10.17-ct spinel, accented with diamonds, orange and yellow sapphires...species but often remains out of the spotlight. Kenya and Tanzania are the major source of tsavorite garnets; |  | | Journal (issue) | | 1981 GOLDEN YELLOW TOURMALINE OF GEM QUALITY FROM KENYA By HENRY A. HĂNNI, 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 |  | Ngoc Khoi, Nguyen, Hauzenberger, Christoph A., Anh Tuan, Duong, HĂ€ger, 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 ShanâRed River shear zone (North Vietnam) Neues Jahrbuch fĂŒr 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 ShanâRed River shear zone...migmatized gneisses and pegmatoids of the Day Nui Con Voi range, Ailao ShanâRed River shear zone, North Vietnam...sillimanite+garnet+spinel+corundum+biotite+Kfeldspar+plagioclase+ilmenite, and (3) sillimanite+garnet+spinel+corun...Key words: corundum deposit, gneiss, Day Nui Con Voi range, Ailao ShanâRed River shear zone, mineralogy...(Fig. 1). Vietnam geologists found corundum and spinel for the first time in the An Phu marble, Luc Yen |  | | Journal (issue) | | Pakistan and Vietnam|Bicoloured grossular from Kenya|Jade-like materials sold in Myanmar|Blue kyanite...jadeite (green), peridot, spinel (red, green, blue and synthetic blue spinel) and zircon (high and low...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 |  | | Journal (issue) | | 28 ct blue spinel, (6) 1.17 ct benitoite, (7) 2.14 ct blue sapphire, (8) 23.18 ct blue spinel, (9) 4.82...8.04 ct orange sapphire, and (18) 3.48 ct pink spinel. The necklace contains 25.85 ct of radiant-cut...(Myanmar, Thailand, and Vietnam), Africa (Tanzania, Kenya, Zimbabwe, Nigeria, and Namibia, as well as Madagascar)...[both jadeite and nephrite], opal, peridot, quartz, spinel, tanzanite, topaz, and tourmaline). Locality information... African sources include several localities in Kenya, Tanzania, and Madagascar. In particular, the John |  | | Journal (issue) | | Considering the musgravite from Sri Lanka with lamellar spinel inclusions (Schmetzer et al., 2005c) as a unique...the pseudobinary system chrysoberyl (BeAl2O4) - spinel (MgAl2O4), are given by Franz and Morteani (2002)...MnO). b a growth structures and colour zoning, spinel lamellae, graphite, feldspar, mica Rare 5.79...gem minerals in Sri Lanka: evidence from corundum-spinel-scheelitetaaffeite-bearing rocks. In: Rammlmair...Abhandlungen, 146(1), 15-28 Schmetzer, K., 2000. Spinel from Ilakaka, Madagascar. Gems & Gemology, 36(2) |  | | Journal (article/letter/editorial) | | Tn n AMERTcAx M rNERALocrsr ]OURNAL VoI. 20 OF TIIE MINERALOGICAL SOCIETY OF AMERICA FEBRUARY, 1935...1904, pp. 957 968. a Lindgren, W., Econ. Geol., voI. 19,1924, p. 3O9. 70 TEE AMERICAN MINERALOGIST...the well known Mine La Motte locality in Madison County, Missouri. The analysis was made on crystals carefully...following: Doelter, C., Handbuch der Mineral chemie, voI.4, pt. | (1926), pp. 645-657,702 (violarite). Hintze...(save violarite) show that they have the typical spinel structurel therefore, their formula should be written |  | Garnier, V., Ohnenstetter, D., Giuliani, G., Maluski, H., Deloule, E., Trong, T. P., Pham Van, L., Hoang Quang, V. (2005) AGE AND SIGNIFICANCE OF RUBY-BEARING MARBLE FROM THE RED RIVER SHEAR ZONE, NORTHERN VIETNAM. The Canadian Mineralogist, 43 (4) 1315-1329 doi:10.2113/gscanmin.43.4.1315 | Journal (article/letter/editorial) | | along the northeastern flank of the Day Nui Con Voi Range in the Red River Shear Zone, in the northern...Vietnam. Crystals of zircon included in ruby and spinel from Luc Yen and An Phu deposits were dated in...two main thermal events: (1) Zircon included in spinel crystals probably crystallized during the Permian...Nord-est de la ceinture mĂ©tamorphique du Day Nui Con Voi dans la zone de cisaillement du Fleuve Rouge, au...deposits from northern Vietnam occur in the Day Nui Con Voi Range (DNCV, Fig. 1A), a metamorphic belt resulting |  | | 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;...31-ct pink sapphire, Sri Lanka; (12) 5.79-ct pink spinel, Pamir Mountains, USSR; (13) 10.15-ct pink topciz...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 |  | | Journal (issue) | | Centre (Kenya) Ltd., Fedha Tower, 2nd Floor, Muindi Mbingu St., PO Box 47928, Nairobi, Kenya 2. Dipartimento...examples of the following gems from Tanzania and Kenya: almandine, apatite, aquamarine, beryl, grossular...cabochon, inclusions. Introduction Tanzania and Kenya now contribute significantly to the world market...obtained by N.R. Barot from North Tanzania and South Kenya and are of known origin (Figure 1). The regional...are from the Taita Mountains and 4 and 5 from the Embu and Meru areas respectively, in Kenya. These areas |  | | Journal (issue) | | discovered a second deposit across the border in Kenya, near Tsavo National Park. The Kenyan governmentâs...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 (article/letter/editorial) | | identiïŹed at all (Shackleton, 1996). In southeast Kenya and northeast Tanzania, within the Mozambique Belt...to subduction in a Neoproterozoic Ocean. In SE Kenya, a major terrane boundary has recently been identiïŹed...location where Frisch and Pohl (1986) identiïŹed the Voi suture zone. In eastern Madagascar, a belt of pelitic...main outcrops are highlighted. Isotopic fronts in Kenya/Tanzania ((1) Maboko and Nakamura, 2002) and southern...shear zone system; Ra = Ranotsara shear zone; Voi = Voi suture; and Vok = Vorokafotra shear zone. the |
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Voi, Taita-Taveta County, Kenya