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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.
The Borough of Koroit was a local government area about 18 kilometres (11 mi) northwest of Warrnambool in western Victoria, Australia. The borough covered an area of 23.07 square kilometres (8.9 sq mi) immediately to the north of the Tower Hill State Game Reserve , and existed from 1870 until 1985.
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.
Boulder opal consists of concretions and fracture fillings in a dark siliceous ironstone matrix. It is found sporadically in western Queensland, from Kynuna in the north, to Yowah and Koroit in the south. [32] Its largest quantities are found around Jundah and Quilpie in South West Queensland.
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Ammolite is an opal-like organic gemstone found primarily along the eastern slopes of the Rocky Mountains of North America.It is commonly unearthed by natural erosion or through the process of various mining practices, within the perimeter of an ancient sea bed called the Western Interior Seaway. [2]