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A stunning rainbow heart boulder opal with a purple-hue
A lovely small green and purple boulder opal specimen shaped like a large tooth or tusk
28 Ct wood replacement opal in a classic rectangle shape
Consequently
A very large and rare boulder opal from our Mt
4.28 Ct wood replacement heart opal Type_Pipe A stunning rainbow heart boulderA lovely 4. 28 Ct wood replacement heart opal. 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 results in the
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