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The Wollo Province opal was different from the previous Ethiopian opal finds in that it more closely resembled the sedimentary opals of Australia and Brazil, with a light background and often vivid play-of-color. [37] Wollo Province opal, more commonly referred to as "Welo" or "Wello" opal, has become the dominant Ethiopian opal in the gem ...
The Ethiopian Empire had no fixed capital until Emperor Fasilides settled in Gondar in 1636. The palace complex served as the residence of the monarchs until 1864. It comprises the royal castle (pictured), several palaces, churches, monasteries, and other buildings.
The lavas of the Ethiopia-Yemen CFB show systematic variations in composition both vertically and laterally. Most of the lavas are basalts, but those closest to the Afar Triangle being very high titanium transitional basalts and picrites, passing outwards into high-Ti tholeiitic basalts and finally into low-Ti tholeiitic basalts.
The Ethiopian Geological Survey of the Ministry of Mines and Energy (MME) with assistance from UNDP and private companies have assessed the mineral and petroleum resources of Ethiopia. The resources discovered in different regions of the country are mainly gold, tantalum , phosphorus , iron , salt , potash , soda ash , gemstones, coal ...
Refractive index readings of faceted gems can range around α = 1.651, β = 1.668, and γ = 1.689, with a biaxial positive birefringence of 0.037–0.038. With decreasing magnesium and increasing iron concentration, the specific gravity, color darkness and refractive indices increase, and the β index shifts toward the γ index.
Elevation generally increases westward towards the Ethiopian and Eritrean highlands, which form steep escarpments. [3] [4] The region is extremely active tectonically, and it experiences many earthquakes associated with the continuing enlargement of the Rift Valley. Volcanoes in the ecoregion are also intermittently active.
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