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| to Watch – Zambian Emeralds The Ethiopian Halo-Shakiso Emerald A Gemological Description of Ethiopian...“Oil-Like” Films – Concerns and Challanges Bringing the Shakiso Story to Market – The Application of Traceability...have also seen new discoveries of emeralds in Ethiopia and increased awareness of the green gem from...with the help of the local firms throughout the region,” said Molina. Aprecol also works with the private...los Andes) has been established in the Free Trade Zone in Bogotá for its emeralds, and brings added value |
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| probably three sutures (Sekerr, Baragoi, Moyale-Shakiso) with ophiolites; they appear to dip E. It is argued...h u n d r e d s of millions of years, involves a zone of simple s h e a r b e t w e e n the descending... The g e o m e t r y of this lithospheric shear zone must necessarily be simple to allow s m o o t h...n t and so it will conform to the standard shear zone pattern as described by R a m s a y & G r a h a...o t i o n and thrusts sub-parallel to the shear zone. Sediments scraped off the trench or ocean floor |
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| Sabbagh Gemology Gem Quality Emeralds from Southern Ethiopia Members Jean Claude Michelou Stephan Reif Gary...promotion of the colored gemstone sector in that region as well as strengthening the activities in Asia...plastic trays to dozens of miners in the Tanga region of Tanzania in January 2017. (Photo: Robert Weldon...seven-person GIA and Pact team traveled to the Tanga region of Tanzania in January 2017 to conduct training...economic development opportunities.” The Tanga region was chosen for the pilot because of its diversity |
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| Points 18 pg. 3 Emeralds from the Fazenda Bonfim Region, Rio Grande do Norte, Brazil J. C. (Hanco) Zwaan...characterize the emerald produced in the Fazenda Bonfim region of northeastern Brazil since 2006. The jewelry... FEATURE ARTICLES EMERALDS FROM THE FAZENDA BONFIM REGION, RIO GRANDE DO NORTE, BRAZIL J. C. (Hanco) Zwaan...emeralds were discovered in the Fazenda Bonfim region of northeastern Brazil. Emerald mineralization...metamorphosed ultramafic rocks within the Santa Monica Shear Zone. Prospecting and exploration have been carried out |
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| Spessartine garnet crystal embedded in muscovite schist matrix, 4.3 cm - Bruce Cairncross specimen and...runs from Madagascar through Tanzania, Kenya, Ethiopia and into the Sudan - has blessed East Africa,...countries are among the finest in the world. The region and its gems are particularly dear to my family...most renowned gemstones from East Africa, this region is also host to some of the world's finest examples...several other varieties of gemstone occur in the region and, while perhaps not as popular, these too have |
 | Giuliani, Gaston, Groat, Lee A., Marshall, Dan, Fallick, Anthony E., Branquet, Yannick (2019) Emerald Deposits: A Review and Enhanced Classification. Minerals, 9 (2) 105 doi:10.3390/min9020105 | Journal (article/letter/editorial) |
| minerlization, i.e., veins, pods, metasomatites, shear zone; type of fluids and their temperature, pressure...Gachalá mines. In 2017, a large piece of biotite schist with several emerald crystals was discovered in...Colombia: 10. Eastern emerald zone (Gachalá, Chivor, Macanal); 11. Western emerald zone (Yacopí, Muzo, Coscuez...Tanzania: 22. Sumbawanga; 23. Manyara. Ethiopia: 24. Kenticha (Halo-Shakiso). Somalia: 25. Boorama. Egypt: 26...Colombia. Average of three analyses [23]. 16. Ethiopia [this study, average of 32 analyses]. Minerals |
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| Robert Weldon survey Brazil’s diamond deposits. This region has produced a significant number of large rough...Omi regions of Niigata Prefecture and the Wakasa region of Tottori Prefecture and compares them with samples...search of a more direct route to the “Indies,” the region of the Indian subcontinent and eastern Africa that...and other gem minerals were found throughout the region. Photo by Robert Weldon/GIA. shipments to Portugal...In 1695, gold was discovered in the mountainous region near Ouro Preto (Southey, 1819), and over the following |
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| danburite from Namalulu, Tanzania|Emerald from Ethiopia|Vivid purplish pink fluorite from Illinois, USA|...El Guanaco in the Taltal area of the Antofagasta Region, Chile. He kindly donated a 1.45 ct stone to Gem-A...mined from granitic pegmatites in the Morogoro region of central Tanzania (Chadwick and Laurs, 2008)...several weak bands were recorded in the visible region at approximately 525, 567, 577, 584, 732, 744 and...792 nm, as well as two dominant bands in the UV region positioned at approximately 275 and 315 nm (Figure |
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| shear zone–related deposits in different substrata, mainly corundum-bearing Mg-Cr-biotite schist). Examples...emerald-bearing desilicated pegmatite (plumasite) and biotite schist. Type IB in sedimentary rocks (China, Canada, Norway...tear faults for the deposits of the western emerald zone (Yacopi, Coscuez, Muzo, Peñas Blancas, Cunas, and...black shales or the deposits of the eastern emerald zone (Gachalá, Chivor, and Macanal mining districts)...in eastern Gondwana Neoproterozoic suture zone Shear zone/thrust fault Figure 2. Juxtaposition of Antarctica |
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| unstable colours 8 / GEMMOLOGY Paraiba excursion Ethiopia emeralds and sapphires Afghanistan emeralds Artificial...Alexander Klumb, and Dr. Hao Wang. GEMMOLOGY ETHIOPIA: NEW SOURCE FOR SAPPHIRES AND EMERALDS rr Figure...Figure 1: Small series of emeralds from Ethiopia analysed recently at SSEF ranging in size from 1.3 to...of the country. This material definitively put Ethiopia on the gem trade map, as it is until today supplying...identified in emeralds from this new source at SSEF. Ethiopia is geologically located at the northern section |
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| Scapolite from Brazil | Spessartine Reportedly from Ethiopia | Diamond Mining at Theindaw, Myanmar | Early...in the 450–500 nm region that is bounded by absorption bands in the visible region that arise from the...green regions with an edge in the yellow-green region caused by a prominent band at ~535 nm. Also present...present was a moderate band at ~665 nm (red region), a weak band at ~855 nm and a moderate band at ~980...quartz from Alpine-type veins in the Ganesh Himal region of Nepal that contained large biotite plates up |
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| Enigmatic Alluvial Sapphires from the Orosmayo Region, Jujuy Province, Northwest Argentina: Insights...mineralization (veins, pods, metasomatites, shear zone) as well as the type of gem-forming fluids and their...Valley), Brazil (Itabira), Colombia (Coscuez), Ethiopia (Shakisso), Madagascar (Mananjary), Russia (Ural...on another occurrence of sapphires in the same region of the South Urals occurring in anorthosites (kyshtymites)...evolution of alluvial sapphires from the Orosmayo region (Jujuy Province, NW Argentina) and importantly |
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| Rainbow moonstone from Zambia • Morganite from Ethiopia • Large natural-color freshwater cultured pearls...et al., 2004). Spectroscopy in the near-infrared region did not reveal any other absorption peaks previously...featureless absorption spectra in the infrared region, unlike those reported in CVD synthetics from other...absorptions were only observed in the 1500– 1100 cm–1 region. These features (e.g., figure 7) included a relatively...infrared and deep-UV regions, with the visible region (400–700 nm) appearing featureless. Notably absent |
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| 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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| and serpentinite; these rocks belong to the Kohút zone of the Veporic Superunit crystalline basement (Bačík...aceite effect. (b) An enlarged view of the hexagonal zone in Figure 5 that lacks the gota de aceite effect...including geometric growth structures and a hexagonal zone that lacked the gota de aceite effect (Figure 6)...occurrence from Kruta Balka, western Peri-Azovian region, Ukraine: Implications for understanding the crystal...a narrow blue zone concentrated along the culet (Figure 11b). The placement of this zone at the culet |
