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A beautiful light green and blue boulder opal
49 Ct small black boulder opal is a wonderful example of mother nature's skill
A small pastel heart boulder opal with light pink
A beautiful narrow stripy boulder opal
4.28 Ct 3D Wood replacement opal Type_Carving A beautiful light green andA lovely 4. 28 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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