Natural Fancy Cut Boulder Opal Cabochon S129
Natural Fancy Cut Boulder Opal Cabochon S129The 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 30.6mmWidest PointsLocation:Queensland, AustraliaHardness:5.5 to 6.5Inclusions:Boulder opal will have seams of precious opal in brown ironstone, quartzite, rhyolite or basalt host rock.Brand newTHIS LISTING HAS BEEN MARKED DOWN