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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 brightness of the fire in opal ranges on a scale of 1 to 5 (with 5 being the brightest) [14] "Girasol opal" is a term sometimes mistakenly and improperly used to refer to fire opals, as well as a type of transparent to semitransparent type milky quartz from Madagascar which displays an asterism, or star effect when cut properly.
127 Hours is a 2010 biographical psychological survival drama film co-written, produced, and directed by Danny Boyle.The film mainly stars James Franco, with Kate Mara, Amber Tamblyn, and Clémence Poésy appearing in brief supporting roles.
Yowah is an outback town and locality in the Shire of Paroo, Queensland, Australia. [2] [3] In the 2021 census, the locality of Yowah had a population of 126 people.[1]The town is known for its opal mining and numerous opal fields that lie around the town as well as the "Yowah nut", a local type of opal distinctive to the region.
In geology, a boulder (or rarely bowlder) [1] is a rock fragment with size greater than 25.6 cm (10.1 in) in diameter. [2] Smaller pieces are called cobbles and pebbles. While a boulder may be small enough to move or roll manually, others are extremely massive. [3] In common usage, a boulder is too large for a person to move.
Bouldering is a form of rock climbing that is performed on small rock formations or artificial rock walls without the use of ropes or harnesses.While bouldering can be done without any equipment, most climbers use climbing shoes to help secure footholds, chalk to keep their hands dry and to provide a firmer grip, and bouldering mats to prevent injuries from falls.
A caver clearing a boulder choke in Stile Pot, Gaping Gill. A boulder choke is a collection of large rocks or rubble that obstructs a shaft or passage in a cave or mine. In order to progress through passages cavers often need to negotiate or clear boulder chokes. Boulder chokes can be formed by rockfall, stream deposition, or mining debris.
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