4.79 Ct wood replacement opal Inner world A pretty small boulder opal

A pretty small boulder opal specimen from our Yaraka opal mine

27 Ct wood replacement opal in a classic squarish shape

A lovely 6

A lovely 11

In cases where the silica infiltrates organic material before complete decomposition occurs

4.79 Ct wood replacement opal Inner world A pretty small boulder opalA 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