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A lovely 11
45 carat boulder opal has a rare combination of colors including orange
A pretty small boulder opal specimen from our Yaraka opal mine
A small purple wood replacement opal
24 Ct wood replacement opal in a large teardrop shape
4.79 Ct wood replacement opal Inner world A lovely 11A lovely 4. 79 Ct wood replacement opal in a modern half circle 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 remarkable
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