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long arch shaped boulder opal specimen with lovely pinks swirls and a strong white stripe
Sits on its side in three different directions
57 Ct flower carving from wood replacement opal
A lovely large round boulder opal with a light body tone (background) and light pastel colours
27 Ct wood replacement opal in a classic squarish shape
6.27 Ct 3D Wood replacement opal Inner world long arch shaped boulder opalA lovely 6. 27 Ct wood replacement opal in a classic squarish 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
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