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A beautiful small stripy boulder opal
A beautiful heart boulder opal with sea green and turquoise colours
A beautiful small heart boulder opal
50 Ct wood replacement opal in a teardrop shape
6.95 Ct wood replacement opal Mine_Yaraka A beautiful small stripy boulderA lovely 6. 95 Ct purple wood replacement opal with a teardrop shape. 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
