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Get one assorted mystery Rough Opal from Australian mines.
These are premium quality opal from Lightning Ridge and Coober Pedy.
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.
You will receive One opal which size may vary from 1 to 3 ct.
Please feel free to contact us if you have any questions, we want you to have the best experience possible.