Australian boulder opal is a precious opal having formed in cracks or cavities in ironstone .
It is found exclusively in Queensland.
Boulder opal is distinguished by the presence of the host rock on the back of the opal seam, which
makes it a very stable opal.
By world standards, It is a "Natural opal,Type 2".
It is found exclusively in Queensland.
Boulder opal is distinguished by the presence of the host rock on the back of the opal seam, which
makes it a very stable opal.
By world standards, It is a "Natural opal,Type 2".
What is Australian boulder opal ?
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Australian boulder opal definition