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  2. Opal - Wikipedia

    en.wikipedia.org/wiki/Opal

    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. [38] Wollo Province opal, more commonly referred to as "Welo" or "Wello" opal, has become the dominant Ethiopian opal in the gem ...

  3. Mining in Ethiopia - Wikipedia

    en.wikipedia.org/wiki/Mining_in_Ethiopia

    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 ...

  4. File:Black opal (Stayish Mine, Wollo Province, Ethiopia) 6 ...

    en.wikipedia.org/wiki/File:Black_opal_(Stayish...

    Description: Precious opal (black opal) from the Tertiary of Ethiopia. (cut & faceted specimen; the long axis is 8 to 9 mm) A mineral is a naturally-occurring, solid, inorganic, crystalline substance having a fairly definite chemical composition and having fairly definite physical properties.

  5. Yowah nut - Wikipedia

    en.wikipedia.org/wiki/Yowah_Nut

    The Yowah opal field in the Shire of Paroo. The Yowah nut is a type of precious opal, found within the Yowah opal fields situated in Yowah, Shire of Paroo, South West Queensland, Australia since the latter part of the 19th century. [1] These opals are known for their distinctive nut-like shape, opalescent patterns, and vibrant colours.

  6. Gemstone - Wikipedia

    en.wikipedia.org/wiki/Gemstone

    In its rough crystalline form, a diamond will do none of these things; it requires proper fashioning and this is called "cut". In gemstones that have color, including colored diamonds, the purity, and beauty of that color is the primary determinant of quality.

  7. Thunderegg - Wikipedia

    en.wikipedia.org/wiki/Thunderegg

    Thundereggs are rough spheres, most about the size of a baseball—though they can range from a little more than a centimeter (one half inch) to over a meter (three feet) across. They usually contain centres of chalcedony which may have been fractured followed by deposition of agate, jasper or opal, [1] either uniquely

  8. Category:Individual opals - Wikipedia

    en.wikipedia.org/wiki/Category:Individual_opals

    Main page; Contents; Current events; Random article; About Wikipedia; Contact us

  9. Hyalite - Wikipedia

    en.wikipedia.org/wiki/Hyalite

    Hyalite is a transparent form of opal with a glassy lustre. It may exhibit an internal play of colors if natural inclusions are present. It is also called Muller's glass, water opal, and jalite. Müller's glass is named after its discoverer, Franz-Joseph Müller von Reichenstein.

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