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Opal formation commences when silica dissolves in water
A lovely free-form boulder opal with a rolling rainbow pattern
A lovely small triangle boulder opal
A very pretty pair of oval boulder opals
70 Ct wood replacement opal
4.48 Ct 3D Wood Replacement Opal Colour_Pink Opal formation commences when silicaA lovely 4. 48 Ct wood replacement opal in a classic rectangle 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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