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A fun free-form boulder opal with green
A wonderful rainbow boulder opal with an unusual darker lilac body tone
28 Ct wood replacement opal in a classic squarish shape
88 Ct wood replacement opal in a classic rectangle shape
A lovely teardrop boulder opal with pink
6.49 Ct Wood replacement opal Tucson A fun free-form boulder opalA lovely 6. 49 Ct wood replacement opal in 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 process
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