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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.
Koroit's War Memorial is located on the edge of the Botanic Gardens. In addition to The Olde Courthouse Inn, Koroit hosts two hotels in the main street, Commercial Road, the Commercial Hotel and Mickey Bourke's Koroit Hotel. The Koroit and Tower Hill Butter and Cheese Factory Company Ltd was established in Koroit in the 1890s.
A Peruvian opal (also called blue opal) is a semi-opaque to opaque blue-green stone found in Peru, which is often cut to include the matrix in the more opaque stones. It does not display a play of color. Blue opal also comes from Oregon and Idaho in the Owyhee region, as well as from Nevada around the Virgin Valley. [17] Opal is also formed by ...
Adavale was the location of Australia's first opal discovery. [9] The town of Yowah is built on an opal field which began producing opals in the 1870s. [24] Opals are also found at Koroit opal field, Quilpie, Eulo and in northern New South Wales. The geological formation containing opals in South West Queensland is called the Winton Formation. [25]
This category is for mines for cardinal gems other than Diamond, ie amethyst, emerald, ruby & sapphire, and also opal mines (see Gemstone). Subcategories This category has the following 3 subcategories, out of 3 total.
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