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A triangle matrix boulder opal
91 Ct wood replacement opal in a modern half circle shape
A lovely deep purple and violet boulder opal
Three lovely small dark purple boulder opal pieces
A gorgeous green-blue boulder opal
8.23 Ct wood replacement opal Price_Mid-range A triangle matrix boulder opalA stunning green, blue and purple wood replacement 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
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