 | | Book | | GEMSTONES of East Africa Burundi, Kenya, Rwanda, Tanzania and Uganda Bruce Cairncross Published by Struik...resources 12 Burundi 13 Kenya 14 Rwanda 16 Tanzania 17 Uganda 20 Gemological properties 21 A to...through Tanzania, Kenya, Ethiopia and into the Sudan - has blessed East Africa, Kenya and Tanzania, with...starting in what was then Tanganyika ( now mainland Tanzania) and then progressing to Kenya - I am proud to...countries are among the finest in the world. The region and its gems are particularly dear to my family |  | Sorokina, Elena S., Rösel, Delia, Häger, Tobias, Mertz-Kraus, Regina, Saul, John M. (2017) LA-ICP-MS U–Pb dating of rutile inclusions within corundum (ruby and sapphire): new constraints on the formation of corundum deposits along the Mozambique belt. Mineralium Deposita, 52 (5) 641-649 doi:10.1007/s00126-017-0732-x | Journal (article/letter/editorial) | | an age of 499 ± 12 Ma for ruby from the Morogoro area, Tanzania. These ages are interpreted as cooling...U–Pb LA-ICP-MS dating . Mozambique belt . Kenya . Tanzania Editorial handling: B. Lehmann * Elena S. Sorokina...Germany 5 Swala Gem Traders, Box, 11063 Arusha, Tanzania Introduction Corundum is a mineral occurring...concordant, the U–Pb age of rutile also shows that the region did not experience a metamorphic overprint above... both in the Mangari area of Kenya, and Morogoro in Tanzania. Geological setting Regional and contact |  | | Journal (issue) | | Industry Special Spinel Pink and Red Gem Spinels in Marble and Placers Spinel from Tajikistan – The Gem That...Spinels from Sri Lanka 54 The Spinels of Mahenge, Tanzania In Search of Cobalt Blue Spinel in Vietnam...InColor Summer 2019 A 7.13-ct spinel from Mahenge, Tanzania. Cover image: Prangpak Ruahong, Nomads. 40...million and China's Hong Kong Special Administrative Region (SAR) with US$30.8 million, said the ministry's...13 Special Spinel Pink and Red Gem Spinels in Marble and Placers The aim of this review is to present |  | 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) | | Vatomandry; (2) Andriba; (Antsirabe-Antanifotsy region, Soamiakatra-Ambohimandroso; Ambohibary); (3) Zazafotsy;...Zazafotsy; Ankaratra (Antsirabe-Antanifotsy region, Soamiakatra-Ambohimandroso; Ambohibary); (3)IlakakaZazafotsy;...John Saul mine; Penny Lane; Aqua, Hard Rock). Tanzania: (10) Umba (9) Mangare (Rockland-formerly John...John Saul mine; Penny Lane; Aqua, Hard Rock). Tanzania: (10) Umba valley; (11) Longido, Lossogonoi; (12)...(12) Winza; Loolera (Kibuko); (13) Morogoro (Mwalazi; Visakazi; valley; (11) Longido, Lossogonoi; (12) Winza; |  | Giuliani, Gaston, Fallick, Anthony, Rakotondrazafy, Michel, Ohnenstetter, Daniel, Andriamamonjy, Alfred, Ralantoarison, Théogène, Rakotosamizanany, Saholy, Razanatseheno, Marie, Offant, Yohann, Garnier, Virginie, Dunaigre, Christian, Schwarz, Dietmar, Mercier, Alain, Ratrimo, Voahangy, Ralison, Bruno (2007) Oxygen isotope systematics of gem corundum deposits in Madagascar: relevance for their geological origin. Mineralium Deposita, 42 (3) 251-270 doi:10.1007/s00126-006-0105-3 | Journal (article/letter/editorial) | | (gneiss, cordieritite, mafic and ultramafic rocks, marble, and calc-silicate rocks). In both domains the...feldspathic gneiss) and 10.7 to 15.6‰ (skarn in marble from Andranondambo). The δ18O values for gem corundum...placer deposits from Sri Lanka, Madagascar, and Tanzania have a large variety of colored sapphires and...deposits linked to basaltic rocks in the northern region (Schwarz et al. 2000). Most of the economic ruby...skarns formed at the contact between granite and marble in the eastern area (Rakotondrazafy et al. 1996) |  | | Book | | First Find of Cr2 O3 Eskolaite Associated with Marble-Hosted Ruby in the Southern Urals and the Problem...Dating of Zircon and Zirconolite Inclusions in Marble-Hosted Gem-Quality Ruby and SpinelfromMogok...the Australasian region. He works closely with his counterparts from the SE Asia region. He leads industry-CODES-funded...which subdivide into mafic-ultramafic (IIA1) and marble (IIA2) types, and Metasomatic hosts (Type IIB)...Accessory zircon and zirconolite grains in the host marble gave similar age spreads from 95 to 17 Ma to the |  | | Journal (issue) | | Roman Empire (Part 1) Cobalt-bearing Spinel from Tanzania Nephrite Jade from Washington State, USA Copper...2022 Presentations Cobalt-bearing Spinel from Tanzania Nephrite Jade from Washingto n State, USA Copper...Cobalt-bearing Blue Spinel from Lukande, near Mahenge, Tanzania By Michael S. Krzemnicki, Alex Leuenberger...the Ambatofinandrahna area of the Amoron’i Mania region in central Madagascar, where it was extracted from...iron-bearing phases mostly come from the Siberian region of Russia (Eaton-Magaña et al. 2019). To our knowledge |  | Sorokina, Elena S., Hofmeister, Wolfgang, Häger, Tobias, Mertz-Kraus, Regina, Buhre, Stephan, Saul, John M. (2016) Morphological and chemical evolution of corundum (ruby and sapphire): Crystal ontogeny reconstructed by EMPA, LA-ICP-MS, and Cr3+Raman mapping. American Mineralogist, 101 (12) 2716-2722 doi:10.2138/am-2016-5614 | Journal (article/letter/editorial) | | Germany 4 Swala Gem Traders, Box 11063, Arusha, Tanzania Abstract The term “ontogeny,” which is commonly...corundum crystals from deposits in Africa (Kenya, Tanzania, Madagascar) and Southeast Asia (Vietnam). Trace-element...~1200 mg/g in sapphire crystals from the Morogoro area of Tanzania caused pink color that correlated with...genesis, geochemistry, crystal morphology, Kenya, Tanzania, Madagascar, Vietnam Introduction “…for a given...deposits in Africa (Mangari area in Kenya, Morogoro in Tanzania, and Andranondambo in Madagascar) and Southeast |  | Krebs, Mandy, Hardman, Matthew, Pearson, David, Luo, Yan, Fagan, Andrew, Sarkar, Chiranjeeb (2020) An Evaluation of the Potential for Determination of the Geographic Origin of Ruby and Sapphire Using an Expanded Trace Element Suite Plus Sr–Pb Isotope Compositions. Minerals, 10 (5) 447 doi:10.3390/min10050447 | Journal (article/letter/editorial) | | deposits: high-Fe amphibolite-type rubies, low-Fe marble-type rubies, and metamorphic blue sapphires. In...Pb isotope ratios, whereas the discrimination of marble-type ruby and metamorphic blue sapphires is limited...provenance determination. Determining the provenance of marble-type rubies and metamorphic blue sapphires remains...Afghanistan) formed during the Himalayan orogeny for marble-hosted ruby deposits; (2) Mozambique and Madagascar...geologically similar deposit types, amphibolite-type and marble-type rubies and metamorphic blue sapphires, using |  | Wu, Jinlin, Sun, Xueying, Ma, Hong, Ning, Peiying, Tang, Na, Ding, Ting, Li, Huihuang, Zhang, Tianyang, Ma, Ying (2023) Purple-Violet Gem Spinel from Tanzania and Myanmar: Inclusion, Spectroscopy, Chemistry, and Color. Minerals, 13 (2) 226 doi:10.3390/min13020226 | Journal (article/letter/editorial) | | minerals Article Purple-Violet Gem Spinel from Tanzania and Myanmar: Inclusion, Spectroscopy, Chemistry...com.cn Abstract: Purple-violet gem spinels from Tanzania and Myanmar have been investigated for their gemological...hue angle and lightless of purple spinels from Tanzania. However, due to the relatively stable content...study are of a limited number of samples from Tanzania and Myanmar. Citation: Wu, J.; Sun, X.; Ma, H...Keywords: purple-violet spinel; inclusion; chemistry; Tanzania; Myanmar Ning, P.; Tang, N.; Ding, T.; Li, H |  | | Book | | gemological wealth of East Africa. This unique region encompasses ·what may be the world's richest gem...gemologist and geologist, Dr. Peter Keller. Kenya and Tanzania are revealed in their full mineralogical splendor...chrome tourmaline are widely identified with the region. ( continuedon backflap) ♦ ♦ ♦ ♦ ♦ ~...Conclusion 11 Chapter 2. Diamond Deposits of Tanzania 15 Location 16 Geology 18 Mining 20 Properties...Northern Province, Tanzania 28 Ruby and Sapphire from Umba, Tanga Province, Tanzania 32 Sapphire from Kenya |  | | Journal (issue) | | Council. Vibrant red spinel of 38 ct from Mahenge, Tanzania. Spinel of 110 ct from Tajikistan certified...is derived from the name Badakhshan, a historic region comprising parts of what is now northeastern Afghanistan...spinels from Tanzania are found near Mahenge in the Morogoro Province in central Tanzania. These vibrant...Further spinels are found at Matombo (central Tanzania) and further in the south in Tunduru. Origin determination...visit the Ipanko spinel deposit near Mahenge in central Tanzania. The Ipanko mining zone itself extends |  | | Journal (issue) | | Turkey|Polymerfilled star enstatite from Norway|Garnet mining in Tanzania|Kyanite from Pakistan|Black star sapphires from...on 1 March 2016 regarding a specimen of ‘ruby in marble’ containing a polished rod of synthetic ruby embedded...embedded in a hole drilled into a piece of marble. After insertion, the exposed portion of the synthetic...near Mahenge, Tanzania In late 2015, a new alluvial garnet deposit was discovered near Mahenge, Tanzania...visited the deposit while on a buying trip to Tanzania. He was told that he was the first foreigner to |  | 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) | | 10.3749/canmin.1700009 PINK AND RED SPINELS IN MARBLE: TRACE ELEMENTS, OXYGEN ISOTOPES, AND SOURCES GASTON...from Paigutan in Nepal, Kiswila and Ipanko in Tanzania, Pamreso in Kenya, Mogok in Myanmar, and An Phu...metasomatic skarn process between granitic intrusives and marble. Trace elements, such as Fe-Zn-Cr-V-Ti, presented...spinels such as those from Kuh-i-Lal. Keywords: marble, pink and red spinel, trace elements, oxygen isotopes...with clinohumite (Chu), edenite (Ed) in a calcitic marble (Cal) from the An Phu quarries, Vietnam. (C) Crystals |  | | Journal (issue) | | west of Sakoany village in the Mahajanga (Majunga) region on the north-western coast of Madagascar, near...(605 nm) was somewhat shifted towards the blue region and it lacked Figure 1: This 4.22 ct celestine...inclusions in the ruby permitted the features in this region to be fully resolved. Corundum is anhydrous and...Because vesuvianite absorbs strongly in the mid-IR region of the spectrum, even minute inclusions can give...vesuvianite showed total absorption corresponded to the region of the compound band structure in the 2.19 ct ruby |  | | Journal (issue) | | South Korea Kamal Kothari, India Bhadresh Pandit, Tanzania Clement Sabbagh, Brazil Capt. Ramji Sharma, Japan...the province of Minas Gerais which is the main region of Brazil for gemstone production. The town is...Brokers Association of Teofilo Otoni and Araçuaí region; Ana Cristina Sena, the secretary of the association;...Australia, Brazil, Colombia, Hong Kong, Japan, Tanzania, Thailand and other major suppliers in the industry...after the British army Fine red spinels from Mahenge, Tanzania. These fabulous gemstones (over 20 carats |  | | Journal (issue) | | articles Traceability of gemstones Geology of ruby marble deposits Mogok research 54 / SSEF SHOWTIME SSEF... Hänsel, SSEF the city of Aksum in the Tigray region of Ethiopia, close to the border to Eritrea. These...Afghanistan, and even East Africa (e.g. Kenya, Tanzania) are prone to containing rather large fissures...of PC1 vs PC2 and PC1 vs PC3. A gray circle is region sometimes show excellent quality and large sizes...Haenni. SSEF RESEARCH MARBLE-HOSTED RUBY DEPOSITS OF THE MOROGORO REGION, TANZANIA D r. Walter A. Balmer |  | | Journal (article/letter/editorial) | | subdivision of the Karoo rocks of the Luwegu Basin (Tanzania) and their biostratigraphic classification based...de l'Afrique du Nord et les s~ries Gondsouthern Tanzania is presented. The Karoo strata attain a wana de... 1. Introduction The Luwegu Basin in southern Tanzania represents the most extensive occurrence of Karoo...border to Mozambique and from the Mbarika and Mahenge Mountains in the west 150 to 200 km to the east...Uranerzbergbau-GmbH (Bonn) and Shell Petroleum Development Tanzania Ltd. (Dares Salaam) the investigations started |  | Keulen, Nynke, Thomsen, Tonny B., Schumacher, John C., Poulsen, Majken D., Kalvig, Per, Vennemann, Torsten, Salimi, Rita (2020) Formation, origin and geographic typing of corundum (ruby and pink sapphire) from the Fiskenæsset complex, Greenland. Lithos, 366. 105536pp. doi:10.1016/j.lithos.2020.105536 | Journal (article/letter/editorial) | | Ruby in Kangerdlussuaq (Maniitsoq region) and on Storø (Nuuk region) formed by a metamorphic reaction...border of the metamorphic field, thus away from the marble and magmatic fields (Figure 4A). The samples are...Seza Kofi and Longido (mainly ultramafic setting, Tanzania) and with the basaltic samples from Cambodia and...samples from Kapisilit and Storø (both in the Nuuk region) also yield δ18O values that lie within the mafic-ultramafic...S–COS–S8–AlO(OH)-bearing fluid inclusions from ruby in marble-hosted deposits from Luc Yen, Vietnam. The ruby-formation |  | | Catalog/List | | the Tsumeb Mine (as well as other mines of the region) were still in production in the 1970s. You will...Azurite Level 8, Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia If the attachment point on the back of...Spitzkopje, Spitzkopje Area, Karibib District, Erongo Region, Namibia Klein Spitzkopje in Afrikaans means: the...Pseudomorph after Azurite Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia Some of the best things to come from the...Epimorph on Cerussite Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia The multiple stages of mineralizing fluids |  | | Journal (issue) | | Ramaura ruby New instruments at SSEF Heating in Mahenge spinel SGM 2015 Diamond research IGC 2015 Micro...is no longer restricted to rubies from the Mogok region. Nonetheless, most rubies from places other than...two elements are usually (Mozambique) or Winza (Tanzania). Much to our surprise, detailed present in any...FACETTE 2016 SSEF RESEARCH SPINEL FROM MAHENGE (TANZANIA) AND ITS HEAT TREATMENT rr Figure 1: Exceptional...Exceptional spinel of 104 ct from Mahenge (Tanzania) together with a few small faceted spinels and spinel |  | Muhongo, S., Kröner, A., Wallbrecher, E., Tuisku, P., Hauzenberger, C., Sommer, H. (2001) Cross-Section Through the Mozambique Belt of East Africa and Implications for Gondwana Assembly. Gondwana Research, 4 (4) 709-710 doi:10.1016/s1342-937x(05)70506-2 | Journal (article/letter/editorial) | | Department of Geology, University of Dar-es-Salaam, Tanzania, E-mail: muhongo@udsm.ac.tz lnstitut fur Geowissenschaften...the best exposures are in East-Central, and NE-Tanzania (Uluguru-, Pare-Usambara mountain ranges); and...granulite-facies rocks of eastern and north eastern Tanzania (Muhongo, et al., 2001). Gneisses (ca. 800°C/10...Ophiolite Complex in the Kenya/ Ethiopia border region. The original gabbro in this complex crystallized...Neoproterozoic high-grade terrains in eastern Tanzania (Maboko, 1995; Muhongo et al., 2001) and central |  | | Journal (article/letter/editorial) | | associated with feldspar pegmatites or the rubies in marble in the Mogok area in Burma ŽHughes, 1990.; Ž3....work concerns primary ruby deposits in Kenya and Tanzania especially those of the Mangari area inside the...Park ŽFig. 1. in SE Kenya. East Africa ŽKenya–Tanzania. is endowed with primary corundum deposits ŽHughes...rubyrsapphire deposit of Umba River in northeast Tanzania by Solesbury Ž1967., and studies of the ruby deposits...In SE Kenya, and apparently continuing into NE Tanzania, most Žor all. of the known primary gemcorundum |  | | Journal (article/letter/editorial) | | gravel deposits in Myanmar (Burma), Sri Lanka, Tanzania and Madagascar. The gravels in each deposit include...of the Umba River valley in northern Tanzania and in the region of Mogok (Myanmar) are especially intriguing...(gem zoisite) diggings at Merelani in northeast Tanzania have been mined for their graphite, and massive...within 50 m of gem spinel diggings at Mahenge in central Tanzania (Figure 4). A foul-smelling organic odour...2014). ‘Mercaptans in Tanzanite from Merelani, Tanzania – A New Type of Stinkstone?’ is the title of a |  | | Journal (issue) | | Richard Gross & Pam Freeman 44 BUSINESS PROFILE: MAHENGE GEMS BRINGS SPINEL TO THE WORLD By Amy Grisak ...is the Saranovski Mine, in Sarany, in the Urals region of Russia. WWW.ROCKNGEM.COM | SEPTEMBER 2022 19...Slovakia; South Africa; Spain; Sweden; Switzerland; Tanzania; United Kingdom; United States WWW.ROCKNGEM.COM...also a component in many rocks such as limestone, marble and carbonatite. Its name comes from the Greek...limestone. Calcite is also the mineral component of marble used in sculpture and decorative household use |
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