The largest deposits are around Jundah and Quilpie in South West Queensland, and the Opalton area near Winton in the north.īoulder Opals from different regions will have distinct characteristics and will often be named after the region where it comes from, such as Yowah nut rather than boulder opal.īoulder Opal is mainly mined by open pit method, but can also be mined using underground techniques.īoulder Opal is thought to have formed between 20 – 40millions years ago.īoulder Opal has a MOH’s hardness of 5.5 – 6.5. It is only found in isolated locations in western Queensland, from Kynuna in the north, to Yowah and Koroit in the south. We own our Boulder Opal Mine in Outback Queensland and are the 1 desitination for genuine Boulder Opal Jewelry Miner Direct. Yowah nut opal is really small boulder opals that look roughly like a nut from a tree. Australian boulder opals are among the most popular types of opals available. However, due to the difference in how boulder opal is formed, there are a variety unique boulder opal patterns that are highly prized, such as: Koriot opal/ Yowah nut: precious opal formed in siliceous ironstone nodules and ripples of colour. FIND YOUR PERFECT BOULDER OPAL JEWELLERY.
Boulder opal consists of concretions and fracture fillings of precious opal, potch or common opal in a dark siliceous ironstone/sandstone matrix. Agira Raw Opal Rough Gemstone, Ethiopian Opal Rock, Jewelry Making. Boulder opal forms brightest and most valuably within cracks and fissures in these boulders. Boulder Opal is a unique variety of opal that is as its name suggests, found in “boulders”.
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