Opal Specimen

330.00 Grams
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Opal Type:
Free Shape
Blue Spectrum

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Polished Opal Mineral Specimen

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

View a video of this unique polished boulder opal mineral specimen here.

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."

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 opal mineral specimen is medium to large in size and feels substantial to hold.

Dimensions: 107x62x34 mm (LxWxD)

Weight: 330 grams


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

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

Free eBook:

Learn more about Australian Boulder Opal.

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See more polished boulder opal mineral specimens here.

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