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  2. Koroit opal field - Wikipedia

    en.wikipedia.org/wiki/Koroit_opal_field

    The Koroit opal field is known for the very distinctive type of boulder opal that is found in its mines. In Queensland boulder opal is found within a 300 km wide belt of sedimentary rocks in the Winton Formation. Here opal is found as a kernel in small concretions. [1] The Koroit Opal field was discovered in 1897 by Lawrence Rostron.

  3. Opal - Wikipedia

    en.wikipedia.org/wiki/Opal

    Polished opal from Yowah (Yowah Nut [23]), Queensland Boulder opal, Carisbrooke Station near Winton, Queensland The primary sources of opal are Australia and Ethiopia, but because of inconsistent and widely varying accountings of their respective levels of extraction, it is difficult to accurately state what proportion of the global supply of ...

  4. 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.

  5. List of minerals - Wikipedia

    en.wikipedia.org/wiki/List_of_minerals

    The slightly misshapen octahedral shape of this rough diamond crystal in matrix is typical of the ... Boulder opal, Carisbrooke Station near Winton, Queensland ...

  6. Fire of Australia opal - Wikipedia

    en.wikipedia.org/wiki/Fire_of_Australia_Opal

    The Fire of Australia opal is a 998 gram uncut opal mined by Walter Bartram in 1946 at the Eight Mile field in Coober Pedy, South Australia. [1] [2] The opal is just under 5,000 carats; roughly equivalent in size to two cricket balls. [1] Although rough-cut, it is polished on two sides. [3]

  7. Galaxy Opal - Wikipedia

    en.wikipedia.org/wiki/Galaxy_Opal

    The Galaxy Opal is the world's largest polished opal, certified by the Guinness Book of World Records in 1992. [1] It was found at the Boi Morto Mine in Brazil in 1976. [ 2 ] The finished opal weighs approximately 3,749 carats , or 0.75 kg.

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