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A dreamy large ocean boulder opal with bright green and blue colours
A pretty half-circle wood replacement opal with light green and purple colours
A lovely small green and blue stripy boulder opal
29 Ct wood replacement opal
Sits on its side in one direction
4.67 Ct wood replacement opal Type_Single A dreamy large ocean boulderA lovely 4. 67 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
