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Raw Rough Boulder Opal Specimen


Raw rough boulder opal specimen for self or gift. Unique, artistic, interesting rock opal mineral specimen for home, office or garden: 900 grams

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Raw Rough Boulder Opal Specimen

The raw rough boulder opal specimen featured in the gallery above is perfect for the opal cutter or rock collector.

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That is to say, the opal cutter may wish to cut and polish it into several gemstones or even a polished mineral specimen for the home or office.

On the other hand, the rock collector (amateur or professional) may wish to add it to their collection as something truly unique.

Regardless of what it will be used for this is a stunning piece.

Queensland Boulder Opal

When it comes to Australian opal, Boulder opal is a type of opal that is only found in Queensland

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The key defining feature of Queensland Boulder Opal is the host rock the opal is found in.

To explain the opal formation event, the most popular theory argues that one hundred million years ago a large shallow inland sea covered one-third of the Australian continent.

The theory holds that the topography around the inland sea was rich in silica.

Over time particles of this silica washed into the sea and bonded with water to form a gel-like substance called hydrated silica or OPAL.

Consequently, the gel flowed into the cracks and crevices of faults and large weathered boulders lying on the ocean floor to create what we now know as Boulder Opal.

Learn more about Boulder Opal here:


Boulder Opal Specialist

At Opal Art Global we specialize in Queensland Boulder Opal.

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Basically, we travel out to the opal fields and buy the raw opal from the mines.

We bring the opal back to our workshop on the coast to sort and process.

Learn more about sorting raw boulder opal here:


We don’t cut everything.

If we think a specimen is best left natural we leave it that way and put it up on the website for the cutter or collector.

Weights and Measures

Weight: 900 grams or 31.75 ounces

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Height (top to bottom): 80 mm / 3.15 inches

Width (left to right): 90 mm / 3.54 inches

Depth (front to back): 60 mm / 2.36 inches



Free Freight, gift wrapping, and 30-day returns


This raw rough boulder opal specimen will arrive gift wrapped with a certificate of authenticity and a small comprehensive information booklet about OPAL.




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