 | | 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...otheryellow yellow tourmaline tourmaline deposits depositsininEast East Africa Africa C.C. Simonet, M.Sc, DUG...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...bicolour tourmaline deposit, thethe geology a major yellow (savannah) and bicolour tourmaline deposit |  | | Book | | noted gemologist and geologist, Dr. Peter Keller. Kenya and Tanzania are revealed in their full mineralogical...pink diamonds. Emerald, alexandrite, garnet, and tourmaline are all significantly present. New discoveries...interest. Rare and unusual garnet and chrome tourmaline are widely identified with the region. ( continuedon...69-carat chrome tourmaline. Courtesy of the 'Irelawney Collection of the Los Angeles County Museum of Natural...Tanzania 32 Sapphire from Kenya 42 Ruby from Mangari, Tsavo West National Park, Kenya 44 Chapter 4. Emerald |  | | 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 |  | | Catalog/List | | Cerussites and Cuprites, Sapphires and Spinels, Tourmaline and Tanzanite, Emeralds and Jeremejevites, the...images and bid online, visit HA.com/5236 57053 Tourmaline Keffi, Nassarawa State, Nigeria Suffering from...from a bit of alluvial wear, this 4.7 cm Tourmaline prism is still very worthy of respect because of its...ET 47 57056 Tourmaline Nampula, Mozambique This lot consists of two green Tourmaline prisms without...could use “burly” to describe this stout prism of Tourmaline. It shows a number of interesting features, starting |  | | Journal (issue) | | 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...complex Upper Proterozoic to around garnet pods in SE Kenya are not retrogressive Lower Phanerozoic province...their work in SE Kenya, Pohl and Neider- also found on either side of the Tanzania/Kenya mayr (1978) concluded |  | | Journal (issue) | | ........................................... 32 Kenya ..................................................Durlabjhi, Jaipur, India; Susie Kennedy, Nairobi, Kenya; Udi Harel, Israel; Tom Cushman, Madagascar; Linus...Jeg Dalek near Soroby, with some production of tourmaline, aquamarine and kunzite (Kunar Valley) in the...became known on the gemstone markets as “Paraiba Tourmaline.” Chemical testing proved that these stones also...Going down the Boqueirao Mine, one of two Paraiba tourmaline mines located close to Parelhas. Photo: Chico |  | | 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 |  | | Report (issue) | | a summer 2017 find at Quan Zhou city, Yong Chun County, Fujian Province. Gemmy, lushly blue-purple cubic...Fluorite, 4.3 cm, from Quan Zhou City, Yong Chun County, Fujian, China. The Arkenstone specimen and photo...green specimens of “chrome tourmaline” from Voi, near Tsavo National Park in Kenya. The smallest specimen...Treasures (1984), and therein to the “Lualenyi mine, Voi, Kenya” chapter, only to be reminded that the green...yet to assign a specific tourmaline-species identity to his “chrome tourmaline”—maybe the right designation |  | | Journal (issue) | | o . 7 JULY 1981 GOLDEN YELLOW TOURMALINE OF GEM QUALITY FROM KENYA By HENRY A. HÄNNI, Ph.D., F.G...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...Recalculating the analyses to the general formula of tourmaline (Table 2), assuming 3 B atoms per formula unit |  | | Journal (issue) | | significant find of gem quality elbaite (lithium tourmaline) was made at the Dunton gem mine, Newry, Maine...the finest examples of New England "watermelon" tourmaline had come from this mine in years gone by, although...rubellite, is truly one of the most significant tourmaline discoveries of all time. The elbaite occurs as...Cross-section (40 mm radius) of "watermelon" tourmaline crystal zoned parallel to the prism. Section...Cross-section (7 em radius) of a "watermelon" tourmaline crystal zoned parallel to the prism. Section |  | | Journal (issue) | | Pakistan and Vietnam|Bicoloured grossular from Kenya|Jade-like materials sold in Myanmar|Blue kyanite...famous for producing exceptional specimens of tourmaline, as well as a variety of other minerals (e.g...matrix specimens consisting 192 of tricolour tourmaline with white albite and green fluorite. According...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) | | this solid solution series occurs between the tourmaline end-members oxy-dravite, Na(Mg2 Al)Al6(BO3)3Si6O18(OH)3O...microprobe analysis, isomorphic series, vanadian tourmaline, UV-visible absorption spectra © The Gemmological...crystals were quickly identified as tourmaline. Numerous tourmaline occurrences are known in Madagascar...undertaken to evaluate the properties of this new tourmaline material in detail. Vanadian tourmalines (dravites...(dravites and uvites) from East Africa (Kenya and Tanzania) have been known in the gem trade since 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) | | 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)...Baringo and Antanifotsy (Soamiakatra) deposits in Kenya deposits in Kenyarespectively. and Madagascar, respectively |  | | Journal (article/letter/editorial) | | Or,is describedfrom the Kwale District, southof Voi, Kenya.The ore mineraloccursas exsolutionlamellaeand...particlesin rutile coexistingwith kyanite,sillimanite, tourmaline,and kornerupinein a highly metamorphosed gneiss...a depositof greenvanadiumbearingkornerupinefrom Kenya (Schmetzeret al., 1974)has revealedthe presence...(4'12'S,38o40'E)in the Kwale Dis-' trict, south of Voi, Kenya. The kornerupinecame from a deeplyweatheredlayerabout...metamorphosed gneiss contains quartz, biotite, tourmaline, diopside,and epidote.The most abundantopaquemineralsare |  | | Journal (issue) | | Tsavorite – the untamed beauty 12 New find in tourmaline deposit in Nigeria 21 Panama Diamond Exchange...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 |  | | 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...Emerald, Aquamarine, Rhodolite Garnet, and Bicolor Tourmaline Stuller.com | 800 877 7777 Issue 48 ׀InColor...retail with the opening of two stores in Bergen County in New Jersey. And, the move paid off. The first...jobs. Today’s consumers are increasingly Pink tourmaline heart over a demanding to know that their jewels |  | | Report (issue) | | Z = 4 X-ray Powder Pattern: Near Lasamba Hill, Kenya; line intensities not given. 4.721, 4.492, 3.316...23 Total 100.64 100.00 (1) Near Lasamba Hill, Kenya; by electron microprobe, average of five analyses;...kornerupine deposit of Precambrian age. Association: tourmaline. Distribution: Schreyerite, rutile, kornerupine...southeast of Lasamba Hill, Kwale district, south of Voi, Kenya. Name: For Professor Waldemar Berdesinski (1911–1990)...(1983) Berdesinskiite, V2 TiO5 , a new mineral from Kenya and additional data for schreyerite, V2 Ti3 O9 |  | | 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 (Ol’khon Gate Straits, Lake... apatite, tourmaline, graphite, pyrrhotite, chalcopyrite, pentlandite (Lasamba Hill, Kenya); rutile,...southeast of Lasamba Hill, Kwale district, south of Voi, Kenya. At Komolo, Tanzania. In Sweden, from the Sätra |  | | Journal (issue) | | (4) 8.14-ct grossular garnet, Kenya; (5) 16.28-ct rubellit8 tourmaline, Queen Mine, Pala, California;...California; (6) 15.18-ct tourmaline, Paraiba, Brazil; (7) 10.42-ct tanzanite, Tanzania; (8) 6.09-ct spessartite...spessartite, Ramona, San Diego County, California; ( 9 ) 10.45-ct tsavorite, Kenya; (10) 4.82-ct emerald, Colombia;...diamond; (16) 6.38-ct ruby, Burma; (17) 3.08ct tourmaline, Paraiba, Brazil; (18) 1.85-ct fancy purple-pink...courtesy of the Natural History Museum of Los Angeles County; 6 is courtesy o f DuQuet lewelers, Inc.; 7 is |  | | Journal (issue) | | 4.82 ct purple sapphire, (10) 5.32 ct Paraíba tourmaline, (11) 2.16 ct demantoid, (12) 1.05 ct emerald...(Myanmar, Thailand, and Vietnam), Africa (Tanzania, Kenya, Zimbabwe, Nigeria, and Namibia, as well as Madagascar)...peridot, quartz, spinel, tanzanite, topaz, and tourmaline). Locality information is both summarized in... 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) |  | | Journal (article/letter/editorial) | | North America; the rare earth pegmatitesb of Llano County (Texas), Minas Geraes(BraziI), Ytterby (Sweden)...San Diego, California, world famous for their tourmaline crystals and lithium minerals, are of Mesozoic...on garnet from a pegmatiteinldaho: Atn. Mineral., voI. 7, p. 172, 1922. Thomson, F. A., and Ballard, S...A. L Genesis of mica pegmatite deposits, Latah County, Idaho: , Econ. Geology,vol. 28, no. 1, pp. 41-58...Abstract in Annotated'Bihliography oJEcon Geology,voi 5, pt. 2,no 251 2eIlolmes, Arthur, Op. cit., p. 315 |  | | 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 |  | | Journal (article/letter/editorial) | | Pegmatit von Ytterby: Bull. Geol'.Inst. Unitt. Upsalo,voI. 9, pp. 183-228, 1910. FrNr.eNo. Pegmatites are...northern Piedmont and Lombardy. A prominent gem tourmaline phase occurs on Elba. Rnlenrxcns: Cornelius,...Beryllvorkommen von Teregova in Rumanien: Z. prakl. Geol., voI. 39 (4), pp. 49-56, 7931. Abstract in Annotated....pegmatites found on the slopes of Mount Kenya in central Kenya and from the vicinity of Sultan Hamud in...Damaraland pegmatites exhibit a phosphate phase, and a tourmaline phase is present in a few Damaraland and Erongo |  | | 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...komerupine, rhodolite, ruby, sapphire, scapolite, tourmaline and zoisite. Optical observations, electron microprobe...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 |
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