Australian boulder opal is precious opal found in cracks or cavities in an ferruginous (containing iron) rock, called ironstone.
It is found exclusively in Queensland.
Boulder opal is cut with leaving a thin layer of the mother rock on the back of the opal seam.
When cut and polished, by world standards, It is a "Natural opal,Type 2".
It is found exclusively in Queensland.
Boulder opal is cut with leaving a thin layer of the mother rock on the back of the opal seam.
When cut and polished, by world standards, It is a "Natural opal,Type 2".
What is boulder opal ?
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