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Boulder opal splits

Signature Opal Pty Ltd - Australian Boulder Opal by SignatureOpal

Solid boulder opal. Rare pattern probably formed millions years ago then an earthquake or ground movement cracked the opal, and we assume pitch filled in the cracks and set over millions of years

Solid Boulder Opal - Rare pattern probably formed millions years ago then earthquake or ground movement cracked the opal. Also we assume potch filled in the cracks and set over millions of years again. THIS IS NATURAL OPAL, NOT MAN MADE!

Koroit Opal from Queensland, Australia

Koroit Opal from Queensland, Australia. Perhaps one of our favourite stones, ever.

Boulder Opal from the Hayricks Mine near Quilpie , Qld. Australia #australiapictures

Another pinner said Boulder Opal from the Hayricks Mine near Quilpie , Qld.had this rock for over 30 years ]

The finished Boulder Opal stone cut from the larger piece of rough....from the Pinkilla Mine in Western Queensland.. Bill Kasso

The finished Boulder Opal stone cut from the larger piece of rough.from the Pinkilla Mine in Western Queensland.

Boulder Opal ready to be cut into Gemstones

Boulder Opal ready to be cut into Gemstones - absolutely fascinating !

unusual stripy Boulder Opal from our Bullgroo Opal Mine North /West of Quilpie , Qld. Australia . We only ever found one large  Boulder that contained this type of opal .

unusual stripy Boulder Opal from our Bullgroo Opal Mine North /West of Quilpie , Qld. We only ever found one large Boulder that contained this type of opal .

Australian Koroit Boulder Opal

Australian Koroit Boulder Opal

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