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Polished Australian Boulder Opal Mineral Specimen

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620.00 Grams
Opal Type:
Free Shape
Blue/Green Spectrum

Description Hide Description- Show Description+

Polished Australian Boulder Opal Mineral Specimen

The polished Australian boulder opal mineral specimen featured in the gallery above is large in size, artistic in shape and blue in color.  

This specimen boasts two beautiful opal faces; one on the front and one on the back. 

The opal face on the front is deep blue with green in color.

The opal face on the back is light blue in color.

There are also two dark blue opal faces on either side of this specimen when it stands on the base.

What is Boulder Opal and where is it found?

Boulder opal is a type of Australian opal that is only found in outback Queensland.

Boulder opal is defined by the host rock the opal is found in.

It is argued that one hundred million years ago, SiO2nH2O (opal) flowed into the cracks and crevices of large weathered boulders, solidified and bonded with the rock to create this unique form of opal.

Because the rock/opal bond is naturally occurring boulder opal is regarded as SOLID opal.

Learn more about boulder opal here:

Made by Us:

At Opal Art Global we specialize in cutting Queensland boulder opal, in fact, we only cut boulder opal.

Opal cutters since 1982 we are industry leaders when it comes to innovation and style.

Boulder opal is naturally a creative raw material and therefore lends itself to artistic interpretation.

In light of this we approach every piece of raw boulder opal that comes into the workshop for processing differently.

Cutting Polished Boulder Opal Mineral Specimens:

The first step in processing boulder opal is sorting.

Sorting means dividing the raw opal into "cutters" and "specimen."

Specimens are further sorted into "raw" and "polished."

Learn more about sorting boulder opal rock here:

As polishing involves cutting and shaping the rock around the opal we look for specimens that have large and interesting opal faces.

Besides this, we consider the type of rock the opal presents in.

The host rock can vary from dense hard ironstone to light, porous sandstone, depending on where (location) it is found.

The hard ironstone is our first preference when it comes to making polished specimens as this type of rock gets the best finish.

Besides getting a great finish the hard ironstone is heavy in relation to size therefore making the specimen useful as a paperweight.

Uses and Care:

Polished boulder opal mineral specimens make great gifts for all occasions.

Birthday, anniversary, retirement, housewarming, just to name a few :).

Care is as easy as - wash in water and dry with a soft cloth - however, avoid dropping on hard surfaces such as tiles.  

Weights and Measures:

This polished Australian boulder opal mineral specimen is large in size and stands proud on a stable polished base.


Height (top to bottom): 7.50 cm / 2.95 inches

Width (left to right): 8 cm / 3.15 inches

Depth (front to back): 4.50 cm / 1.77 inches

Weight: 619 grams / 21.83 ounces


Free Freight, gift wrapping, and 30-day returns...

This polished Australian boulder opal mineral specimen will arrive securely boxed/gift wrapped with a certificate of authenticity and a small comprehensive information booklet about OPAL.

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