$500Median
27Sold (12 mo)
$85Last sale
Opal Var. BOULDER Opal in IRONSTONE
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A stunning specimen of the Opal variety known as 'Boulder Opal' from one of the less well-known Australian opal localities of Quilpie in southern Queensland, Australia. The siliceous ironstone matrix varies from milk chocolate to dark chocolate-brown and is part of a larger concretion which has fractured internally at some stage of its formation, similar to a septarian nodule. In this case, the fracture filling has been a colloidal silicate gel leading to the formation of Opal. The specimen has been sawn to form a base and is highly polished on all faces. The display face is a spectacular network of polygonal facture infillings of electric blue and green Opal with a major opalized area of approximately 6.5 x 4 cm. The Opal is predominantly vivid shades of blue, mauve, violet and green, but shows occasional bright flashes of orange-red. A thoroughly excellent example of 'Boulder Opal' from Queensland and of high-end museum quality.
Product details
SpeciesOpal
SizeSmall Cabinet
Dimensions8.8 x 9.4 x 3.6 cm
Added on10/24/2024
LocalityAustralia, Queensland
Current owner
Unknown Owner
- Acquired
- Jul 2026
- Price paid
- $6,500.00
Previous owners
| Date | Collector | Acquisition price |
|---|---|---|
| — | Crystal Classics | Not disclosed |
Learn more
Mineral guide
Learn about Opal
amorphous silica with water and a spectacular play-of-color; black, boulder, and fire opal varieties capture brightness, color, and collecting appeal.Regional guide
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