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What is boulder opal?

Updated: 5/27/2024
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15y ago

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Boulder opal is distinct from black opal in the following ways: * Boulder opal is usually mined in open-cut operations while black opal is mined in shafts. * Boulder opal is found in ironstone boulders, while black opal is found in seams.

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15y ago
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2w ago

Boulder opal is a type of opal that forms within ironstone boulders. The opal forms in thin layers within the crevices or cavities of the boulder, creating unique patterns and colors. Boulder opal is known for its play of color and is mined primarily in Australia.

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What is a Yowah nut?

A Yowah nut is a boulder opal, a precious stone, originating in Yowah, Australia.


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The value of opals and amethysts can vary depending on factors such as quality, size, and rarity. In general, high-quality opals can be more valuable than amethysts due to their uniqueness and play-of-color. Ultimately, it's best to have both evaluated by a professional to determine their worth accurately.


How many types of opals are there?

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