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Great opportunity to get a Spectacular 100ct Mixed Parcel of Natural Rough Australian Opals which are ready to cut and polish.
In Australia, precious opal is found in Cretaceous age sandstones and mudstones. These sedimentary rocks were deeply weathered and this weathering released silica into the groundwater. Small faults and joints in the rocks formed pathways for movement of the groundwater as it penetrated downwards.
Impermeable barriers between the sandstone and the underlying rocks trapped the silica-carrying groundwater where it slowly hardened into a gel-forming opal in veins and lenses.
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