 | | Book | | GEMSTONES of East Africa Burundi, Kenya, Rwanda, Tanzania and Uganda Bruce Cairncross Published by Struik...Page 5: (top) Reticulated aggregates of twinned rutile crystals partially included in transparent quartz...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 |  | 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) | | 1007/s00126-017-0732-x LETTER LA-ICP-MS U–Pb dating of rutile inclusions within corundum (ruby and sapphire):...to rutile inclusions in corundum from localities along the Mozambique belt. U–Pb dating of rutile inclusions...an age of 499 ± 12 Ma for ruby from the Morogoro area, Tanzania. These ages are interpreted as cooling...deposits. Keywords Rutile . Corundum . U–Pb LA-ICP-MS dating . Mozambique belt . Kenya . Tanzania Editorial handling:...Germany 5 Swala Gem Traders, Box, 11063 Arusha, Tanzania Introduction Corundum is a mineral occurring |  | 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; |  | | 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., |  | | 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 figure, it separated fields 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 “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 |  | | 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 |  | 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) | | 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...Ambondromifehy area and on Nosy Be Island (Fig. 1). The region is mostly covered by a 3,500-km2 area of volcanic...Ar–Ar biotite (19) Granulite facies Cordierite–rutile– phlogopite– saphirine– plagioclase–ruby V: 5...province, the BGY sapphires from the Ankaratra region have δ18O between 4.5 and 6.9‰ (n=3) whereas ruby |  | | Report (issue) | | Manyara Region, Tanzania; brilliant red spinel octahedrons from Mahenge, Morogoro Region, Tanzania; and...octahedral crystals, from a “new find” at Ruaha, near Mahenge. These newer spinels look very fine and are unusual...$750. Spinel, 4.8 cm, from Ruaha, Manyara Region, Tanzania. Marin Mineral Company specimen and photo... 3.2 cm, from the Merelani mines, Manyara Region, Tanzania. Marin Mineral Company specimen and photo...ugly/peculiar crystals of monazite, fergusonite, rutile, serendibite, even of highly radioactive thorite—(Th |  | | 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 |  | | Report (issue) | | = 22.01–22.20 Z=2 X-ray Powder Pattern: Mahenge, Tanzania. 2.505 (10), 2.648 (8), 2.812 (6), 2.131 (6)...0.22 Si0.18 Fe0.04 )Σ=11.90 O18.95 . (2) Mahenge, Tanzania; by electron microprobe, average of 14 analyses...clinozoisite (Mahenge, Tanzania); vesuvianite, hercynite, corundum, andalusite, kyanite, diopside, rutile, titanite...Ambindandrakemba, Madagascar. In Tanzania, in the Furura granulite complex, southwest of Mahenge. In the Shoriya Mountains...clinozoisite in a calc-silicate granulite from southern Tanzania. Mineral. Mag., 43, 995–1003. (4) Kato, K. and |  | | Journal (issue) | | Turkey|Polymerfilled star enstatite from Norway|Garnet mining in Tanzania|Kyanite from Pakistan|Black star sapphires from...with asterism reportedly caused by thin oriented rutile needles intersecting one another at 51° and 64°...enstatite with star and cat’seye phenomena due to rutile needles and 98 fibrous sillimanite were described...consisted of rutile and apatite, as well as an unidentified phase. The presence of ilmenite and rutile inclusions...near Mahenge, Tanzania In late 2015, a new alluvial garnet deposit was discovered near Mahenge, Tanzania |  | 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) | | Montepuez in Mozambique [23], the Winza deposit in Tanzania [24,25], and a deposit in the Zahamena National...ppm); (2) Common inclusions are amphibole, mica, rutile (crystals and needles), and zircon. One exception...Red–purplish red 8 red 6 Myanmar (MMR) Mandalay Region: 1 Sagyin, 2 Wet Loo, 3 Mogok Stone Tract, 4 Dattaw...Pinkish red–purplish red 11 Tanzania (TZA) Mahenge, Morogoro region Red 9 Blue–dark blue 8 Pale...A-37145a–c, A-36928a–b, A-91729 Mozambique (MOZ) Tanzania (TZA) Location Amphibolite-type ruby deposits |  | | 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...parallel-oriented needles and small platelets, possibly rutile. Tiny fractures were seen along partially healed...Garnet from Mahenge, Tanzania The Mahenge area in the Morogoro region of south-central Tanzania is a well-known...sold as ‘Mahenge Malaya’. He obtained the rough material in mid-December 2015 in Arusha, Tanzania. Consisting |  | | 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... showed relatively few inclusions (mainly tiny rutile needles), which substance shows a characteristic...a dense pattern of fine rutile needles. As a reminder: the presence of rutile needles does not exclude...of PC1 vs PC2 and PC1 vs PC3. A gray circle is region sometimes show excellent quality and large sizes |  | TENCZER, V., HAUZENBERGER, C. A., FRITZ, H., HOINKES, G., MUHONGO, S., KLÖTZLI, U. (2011) The P-T-X(fluid) evolution of meta-anorthosites in the Eastern Granulites, Tanzania. Journal of Metamorphic Geology, 29 (5) 537-560 doi:10.1111/j.1525-1314.2011.00929.x | Journal (article/letter/editorial) | | of meta-anorthosites in the Eastern Granulites, Tanzania V . T E N C Z E R , 1 C . A . H A U Z E N B E...Geology, University of Dar es Salaam, Dar es Salaam, Tanzania 3 Center for Earth Sciences, University of Vienna...constituents of the Neoproterozoic Eastern Granulites in Tanzania. The mineral assemblage (and accessory components)...garnet, amphibole; scapolite, epidote, biotite, rutile, titanite, ilmenite and quartz. Within the feldspar-rich...Granulites; Mozambique Belt; P–T–X evolution; Tanzania. INTRODUCTION Although anorthosites are unique |  | | 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 |  | 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...TiO2 is the chemical formula for rutile, brookite and anatase. Rutile however, is the most likely mineral...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...9B), spinel and chromite (Figures 8C, 9C), and rutile (Figure 8A). Zircon (Figure 9D) and possible Pr |  | | Journal (article/letter/editorial) | | 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...sillimanite and, in lesser proportions, garnet, graphite, rutile, zircon and titanite. Flattened plagioclase grains |  | 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...enstatite, forsterite, gem clinohumite, chondrodite, rutile (Rt), graphite (Gr), pyrrhotite (Po), and pyrite...magnesite, Frich phlogopite, pyrrhotite, pyrite, rutile, uvite, graphite, and mackinawite (Fig. 1E). Grew...Kenya, the Pamreso spinel occurrence, in the Voi region, is spatially associated with tsavorite deposits |  | | 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...Both, sapphires and rubies may contain very fine rutile needles in zones, poetically also described as...as ‘silk’. If not too dense, this fine rutile ‘silk’ in fact has a softening effect of colour by evenly...their best qualities are very clean with only tiny rutile needles in zones, dust lines and finely dispersed |  | | Catalog/List | | extremely large 21.33-carat Garnet from Tanzania arguably the finest Mahenge has ever produced • A 32.60-carat...60-carat Chrome Tourmaline (“The Kilimanjaro”) from Tanzania superlative for its size and quality • The finest... Gemstones 72001 Gemstone: Rhodolite Garnet - 3.85 Cts. Tanzania This nearly 4 carat Rhodolite Garnet offers an... 72002 Gemstone: Rhodolite Garnet - 4.41 Cts. Tanzania This impactful Rhodolite Garnet packs a punch...punch. The kite shaped Garnet has incredible “Mahenge” color. The pinkpurple-red hue is stunning, well-balanced |  | | 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) | | and Tanzania, the Montepuez ruby deposit in Mozambique, the Mahenge spinel deposit in Tanzania, and...secondary consequence of gold prospecting. In Northern Tanzania and southeastern Kenya, a dry part of Africa underlain...this prospect on the border between Kenya and Tanzania in 2008. In a place where the soil cover was thick...investment justifies it. Some countries, like Tanzania and Ethiopia, have policies placing gemstone mining...Tanzanite One in 2011 for a tsavorite deposit in Tanzania. But established standards in the scientific process |  | | 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 |
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