An Australian boulder matrix opal is a precious opal mixed with the parent rock ( ironstone) rather than in seams or patches, like boulder opal.
The parent rock is a ferruginous rock ( containing iron ), and is called ironstone.
It is found exclusively in Queensland.
When cut and polished, by world standards, It is a "Natural opal,Type 3".
The parent rock is a ferruginous rock ( containing iron ), and is called ironstone.
It is found exclusively in Queensland.
When cut and polished, by world standards, It is a "Natural opal,Type 3".
What is boulder opal matrix ?
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