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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 ...
Gold, gemstones (diamonds and sapphires), and industrial minerals are important commodities for the country's export-oriented growth strategy. [1] The country has deposits of coal, opal, gemstones, kaolin, iron ore, soda ash, and tantalum, but only gold is mined in significant quantities.
No gemstone can match its spectacular 'play of color' or uniqueness. Australia produces 95% of the world's opal. Australian opal is sedimentry, whereas other opal from countries such as Indonesia, America, Peru, Mexico, Hungary and Poland is mostly volcanic. Quality opal commands a lower price per carrot than diamond and is magnificent.
Gem-quality opal, or precious opal, has a wonderful rainbow play of colors (opalescence). This play of color is the result of light being diffracted by planes of voids between large areas of regularly packed, same-sized opal colloids. Different opalescent colors are produced by colloids of differing sizes.
This is a list of countries by diamond production, based on data reported by the Kimberley Process Certification Scheme. Diamond production [1] (million carats)
The claim: Donald Trump can't travel to Canada because he is a convicted felon. A Dec. 3 Threads post (direct link, archive link) offers a theory as to why Canadian Prime Minister Justin Trudeau ...
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