Boulder matrix opal is only found in Queensland, Australia:
• Boulder matrix opal is is a naturally occuring precious opal mixed with the parent rock ( ironstone)
• A boulder matrix opal is never treated in any way.
• It must not to be confused with the Andamooka matrix from South Australia, which the mother rock is of a different composition and must be treated before cutting and polishing to accentuate the opal colours.
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