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A small triangle boulder opal with great rolling rainbow colours
45 carat boulder opal has a rare combination of colors including orange
A very unusual and bright sea green boulder opal
A beautiful round boulder opal with green veins on a dark ironstone face
A pretty lighter blue
2.45 Ct wood replacement opal Type_Tiny A small triangle boulder opalA lovely small 2. 45 Ct 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 the
