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A lovely pentagon boulder opal with a rolling bright blue and green flash
Add it to your collection and experience the natural wonder of this rare gemstone
4 mm is it also a very versatile size
We don't get these very often
A lovely small teardrop boulder opal with rainbow stripes
3.93 Ct 3D Wood replacement opal Type_Pair A lovely pentagon boulder opalA beautiful 3. 93 Ct wood replacement opal in a lovely 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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