Boulder Opal for sale
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.[20] Its largest quantities are found around Jundah and Quilpie (known as the “home of the boulder opal”[21]) in South West Queensland. Australia also has opalised fossil remains, including dinosaur bones in New South Wales, and marine creatures in South Australia.[22] The rarest type of Australian opal is “pipe” opal, closely related to boulder opal, which forms in sandstone with some iron oxide content, usually as fossilized tree roots.