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A lovely rectangle boulder opal with a bright green-blue horizon
40 x 30 mm
At our Russells opal mine we have found that this silica solution occupies a void most probably left by decaying tree roots or branches
purple and green colours in direct sunlight
A gorgeous purple boulder opal with flecks of green
2.01 Ct teardrop wood replacement opal Type_Set A lovely rectangle boulder opalA beautiful 2. 01 Ct wood replacement opal with a pin fire pattern in purple and green colours. 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
