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Opal replacement of Clam Fossil
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Unknown Owner
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This aesthetic, colorful specimen is a fossil bivalve animal that has been completely replaced by opal, a rare occurrence in the famous opal beds of Coober Pedy, Australia. These are Cretaceous aged fossils, about 100 million years old! Most simply do not have such strong jewelry-grade play of color as this one, which is actually quite nice for even making into a pendant or jewelry object. It is one of the best thumbnail-sized mineral specimen-quality examples that we have had for sale, for the combination of size/quality/color/completeness. We do not get these often. Every few years, we might find an opal source willing to sell a few reasonably rather than chop them up to pieces for jewelry, but they are, and always have been, expensive as they are also gem materials.
Product details
SpeciesOpal
SizeMiniature
Dimensions3.0 x 1.9 x 0.8 cm
Added on12/02/2024
LocalityAustralia, South Australia
Known provenance
| Date | Collector | Acquisition price |
|---|---|---|
| 07/2026 | Unknown Owner | $1,850.00 |
| — | The Arkenstone | 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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