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A beautiful pill-shaped boulder opal with bright green and blue colours
A beautiful black boulder opal with bright greens and blues
A lovely opal pair
A wonderful rainbow boulder opal with an unusual darker lilac body tone
the organic molecules are replaced by silica
10.22 Ct 3D wood replacement opal Price_Mid-range A beautiful pill-shaped boulder opalA beautiful 10. 22 Ct wood replacement opal with a long narrow triangle 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
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