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A lovely boulder opal specimen from our Yaraka opal mine
A pretty small boulder opal specimen from our Yaraka opal mine
This beautiful boulder opal features beautiful purple hues and caramel colours
A very dark and mysterious boulder opal from our Mt
A fun free-form boulder opal with green
4.82 Ct 3D Wood Replacement Opal Price_Mid-range A lovely boulder opal specimenA lovely 4. 82 Ct wood replacement opal. What is Wood Replacement opal? Opal formation commences when silica dissolves in water. At our Russells opal mine we have found that this silica solution occupies a void most probably left by decaying tree roots or branches. In cases where the silica infiltrates organic material before complete decomposition occurs, the organic molecules are replaced by silica. This remarkable process results in the meticulous
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