Natural Fancy Cut Boulder Opal Cabochon S129
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Natural Fancy Cut Boulder Opal Cabochon S129 The name boulder opal refers to the way in which these minerals are formed; unlike black opals, which primarily form in igneous vugs and cracks, Boulder Opals form in sedimentary ironstone concretions. Dimension: 23mm X 30.6mm Widest Points Location: Queensland, Australia Hardness: 5.5 to 6.5 Inclusions: Boulder opal will have seams of precious opal in brown ironstone, quartzite, rhyolite or basalt host rock. Brand new
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