 | | 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 |  | | Journal (issue) | | 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...ancient Kingdom of Balascia, related to Badakhshan, a region spanning parts of present-day Afghanistan and Tajikistan...are found in Tajikistan, Myanmar, Vietnam and Tanzania (Yavorskyy and Hughes, 2010; Giuliani et al., |  | 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; |  | 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...We identified a number of inclusions, including dolomite, phlogopite, and forsterite in Tanzanian spinel...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 |  | | Book | | the Australasian region. He works closely with his counterparts from the SE Asia region. He leads industry-CODES-funded...deposits from Montepeluez, Mozambique; Winza, Tanzania; Andilamena/Zahmena and Ampanihy/Toliara, Madagascar...Luc Yen, Vietnam; Jegdalek, Afghanistan; Morogoro, Tanzania. Metamorphic blue sapphire deposits included...triangular ďŹgure, it separated ďŹelds from Winza, Tanzania, Namehaca, Mozambique and Ampanihy and Zahmena...and Fe vs. V could roughly divide Myanmar and Morogoro area rubies, while ternary diagrams for Fe/Mg |  | 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 âontogeny,â 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 ââŚfor a given...deposits in Africa (Mangari area in Kenya, Morogoro in Tanzania, and Andranondambo in Madagascar) and Southeast |  | | 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) | | Turkey|Polymerfilled star enstatite from Norway|Garnet mining in Tanzania|Kyanite from Pakistan|Black star sapphires from...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...conditions caused by the rainy season. From the town of Mahenge, Hashmi was taken by motorcycle to Mbella near...a portion of the garnet-mining area near Mahenge, Tanzania. Photo by Farooq Hashmi. Gem Notes 101 |  | 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 SrâPb Isotope Compositions. Minerals, 10 (5) 447 doi:10.3390/min10050447 | Journal (article/letter/editorial) | | Montepuez in Mozambique [23], the Winza deposit in Tanzania [24,25], and a deposit in the Zahamena National...Redâpurplish red 8 red 6 Myanmar (MMR) Mandalay Region: 1 Sagyin, 2 Wet Loo, 3 Mogok Stone Tract, 4 Dattaw...Pinkish redâpurplish red 11 Tanzania (TZA) Mahenge, Morogoro region Red 9 Blueâdark blue 8 Pale...A-37145aâc, A-36928aâb, A-91729 Mozambique (MOZ) Tanzania (TZA) Location Amphibolite-type ruby deposits...(Mandalay Region and Namya), Vietnam (Luc Yen), Afghanistan (Jegdalek), and Tanzania (Mahenge Mountains |  | | 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 |  | 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) | | from Paigutan in Nepal, Kiswila and Ipanko in Tanzania, Pamreso in Kenya, Mogok in Myanmar, and An Phu...in Tajikistan, Myanmar, Vietnam (Fig. 1A), and Tanzania (Yavorskyy & Hughes 2010). Occurrences are known...(Fig. 5). Marble paragenesis consists of calcite, dolomite, spinel, forsterite, clinohumite, apatite, margarite...marbles associated with mostly calcite (Cal) - dolomite (Dol), forsterite (Fo), clinohumite (Chu), pargasite...and spinel separately, and along with calcite, dolomite, diopside, chondrodite, pargasite, clinohumite |  | | 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...The stones from Vietnam are found in the karsty dolomite marbles of Luc Yen in northern Vietnam. They commonly...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 |  | | 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 (article/letter/editorial) | | shows them to have multiple excitation peaks in the region 600â800 nm, which are caused by the jump of Cr3+...Spinels of other origins, such as Vietnam and Tanzania, that have a pinkish red and reddish pink color...metamorphism of soluble rocks, such as limestone and dolomite, by magma intrusion. The Man Sin mine in Myanmar...middle of the which are composite peaks ofopaque dolomite andmaterial scheelite. them, 175inclusion, cm...spinel-sample 792 cmRaman to the Raman spectra of dolomite [14]; 110 cmâ1 ,inclusions 205 cmâ1 , â 1 â 1 |  | | Journal (issue) | | 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...RESEARCH MARBLE-HOSTED RUBY DEPOSITS OF THE MOROGORO REGION, TANZANIA D r. Walter A. Balmer, research associate...episode which is in the range of ~580 Ma. in Tanzania. The study was published in the Journal of African |  | | Journal (article/letter/editorial) | | work concerns primary ruby deposits in Kenya and Tanzania especially those of the Mangari area inside the...Park Ĺ˝Fig. 1. in SE Kenya. East Africa Ĺ˝KenyaâTanzania. is endowed with primary corundum deposits Ĺ˝Hughes...rubyrsapphire deposit of Umba River in northeast Tanzania by Solesbury Ĺ˝1967., and studies of the ruby deposits...In SE Kenya, and apparently continuing into NE Tanzania, most Ĺ˝or all. of the known primary gemcorundum...are predominantly made up of carbonates âmostly dolomiteâwith minor contents of tremolite, anthophyllite |  | | Journal (article/letter/editorial) | | metamorphism in the Mozambique belt of east-central Tanzania: A petrological, geochemical and geochronological...metamorphism in the Mozambique belt of east-central Tanzania: A petrological, geochemical and geochronological...metamorphism in the Mozambique belt of east-central Tanzania: A petrological, geochemical and PT geochronological...CE PT ED Running title: HT/HP granulites of Tanzania 1 ACCEPTED MANUSCRIPT ABSTRACT This study investigated...rocks from the Mozambique belt of east-central Tanzania, collected close to the town of Ifakara and the |  | | Journal (issue) | | pyrite mixture from Colombia|Garnet from Mahenge, Tanzania|Grandidierite from Madagascar|Lalique quartz...danburite; heat treatment of spinel from Mahenge, Tanzania; cobalt diffusion-treated spinel; a challenging...Colombia produced intergrowths of pyrite, emerald and dolomite. Cabochons cut from this material are quite distinctive...g. Figure 8). The ratio of pyrite, emerald and dolomite in the samples was highly variable. In two of...typically formed by a granular mixture of emerald and dolomite (again, see Figure 9)âexcept for the marquise-shaped |  | | Journal (issue) | | Gem News International Chondrodite from Tanzania ⢠Blue dolomite from Colombia ⢠Fluorite from Namibia...Culture Yellowish Green Diopside and Tremolite from Tanzania Polymer-Impregnated Turquoise Fall 2007 The Transformation...GIA Laboratory Rubies and Sapphires from Winza, Tanzania The Wittelsbach Blue Spring 2009 The French Blue...Polymer-Filled Aquamarine Yellow-Green HaĂźyne from Tanzania Aquamarine from Masino-Bregaglia Massif, Italy...Chrysoprase and Prase Opal from Haneti, Central Tanzania Demantoid from Val Malenco, Italy Spring 2010 |  | | 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 |  | | Journal (article/letter/editorial) | | clinozoisite in a calc-silicate granulite from southern Tanzania P. MAASKANT, J. J. M. M. M. COOLEN, AND E. A....rocks in the Furua Granulite Complex in southern Tanzania. The mineral forms yellowish-brown lath-shaped...garnet-biotite gneisses, and marbles with a varying dolomite content. Mineral parageneses are indicative of...amphibolites and gneisses (Letuvninkas, I97 0. Dolomite-rich marbles give assemblages with chondrodite...mineral in the Furua Granulite Complex in southern Tanzania. This complex forms a part of the five Quarter |  | | Journal (article/letter/editorial) | | metamorphic rocks from the Mozambique belt of SW Tanzania H. Sommer a,â, A. KrĂśner a, b a b Institut fĂźr...February 2013 Available online 1 March 2013 Keywords: Tanzania Granulite Metamorphic petrology PâT-Path Zircon...(Pan-African) Mozambique belt of southwestern Tanzania, around the town of Songea, can be subdivided...granulite-facies terrains in the Mozambique belt of Tanzania. Single zircon PbâPb evaporation and U-Pb SHRIMP...those farther east in the Masasi area of southern Tanzania, as well as in northern Mozambique and in southern |  | 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 FiskenĂŚsset 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...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...pressure decrease would move the rocks into the P-T region for Plg-Crd-Spr-Oam (Figure 11), where cordierite...the FC, and those from e.g. Winza or Longido, Tanzania, are phlogopitites or anthophyllitites, or other |  | | Journal (issue) | | sequence. B lue spinels are mined in Sri Lanka, Tanzania, Myanmar, Pakistan, and Vietnam (Shigley and Stockton...composed of calcite (sometimes magnesian) and dolomite. The major additional phases are olivine and pargasite...and dolomite (right, magnified 65Ă). Ap = apatite, Cc = calcite, Clh = clinochlore, Dol = dolomite, Ol...showed exsolution features between calcite and dolomite, and intergrown apatite and calcite (figure 7a)...observed only in olivine-rich lenses, associated with dolomite and calcite (figure 8). No blue spinel is observed |  | | Journal (issue) | | of Aurora Gems; (6) a 9.15 ct ruby from Winza, Tanzania, courtesy of Hakimi & Sons; (7) a 14.80 ct âgoldenâ...Africa, and its interest in the Williamson mine of Tanzania. Soon after the Cullinan deal went though (July...Weldon, 2009). One new source of corundum, Winza in Tanzania, began yielding some fine-quality ruby in 2007...with the opening of a new mine in the Nova Era region and technological developments at established mines...licensed to mine tanzanite at Block C in Merelani, Tanzania. This high-security screen enclosure (designed |
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