 | | Journal (issue) | | 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 |  | | Report (chapter) | | 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 |  | | Journal (issue) | | Species Age Dating of Zircon Inclusions in Sapphire Ethiopia Field Report 2019 Tucson Report Spring 2019... Land of Origins: A Gemological Expedition to Ethiopia Wim Vertriest, Daniel Girma, Patcharee Wongrawang...opal, and emerald mining and trading areas of Ethiopia. REGULAR FEATURES 29 The Dr. Edward J. Gübelin...pleochroism. Our final paper is a field report on Ethiopia, a new land of opportunity for colored gems. The...The 2016 discovery of fine emerald at Shakiso in the southern part of the country, coupled with the 2017 |  | 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...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...lherzolite (Lrz) that is transformed into serpentinite (Srp), region of Montemaggiore on the Corsican cape |  | | Journal (issue) | | 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 |  | | Journal (issue) | | 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 |  | | Book | | 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...important source of fine gem material. Furthermore, the region has produced some desirable collector mineral and |  | | Journal (issue) | | pegmatites in M-UMR and marble, skarn deposits, and shear zone–related deposits in different substrata, mainly...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...and Sahambano (ZS), deposits from the Vohibory region (Vo), Ambatomena (Am), Andranondambo (An), Andilamena |  | | Book | | 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 |  | | Journal (issue) | | 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 |  | | Journal (issue) | | bodies of amphibolite and serpentinite; these rocks belong to the Kohút zone of the Veporic Superunit...crystals are hosted by talc-magnesite veins in the serpentinite body, which formed as a consequence of the fluid...during regional metamorphic events. The talc and serpentinite (used as a building stone) were worked in a...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) |
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