Opal Replacing Bivalve fossil / 22.90 grams / Coober Pedy, Australia


Shipping to United States: Free

One of the great classics in terms of Australian Opal. The myriad of Opal found in Australia ranges from the finest Black Opals in the world to many precious multi-color Opals including what I believe are the most iconic Opal / fossil pseudomorphs extant. This piece was mined in the mid 1960s and features a well-preserved bivalve mollusc shell which has been not only fossilized, but partially replaced by gemmy multi-color Precious Opal. The top portion of the piece features flashes of glowing green, blue, purple Opal (with tiny red and orange spots here and there) which glow in the light. Additionally, when the piece is backlit, you can see a bit of a golden interior. I love the fact that you can see the striations / growth lines of the shell, so it's clearly NOT polished and very well-preserved! The piece is complete all around, though there is a small point on the top where it was contacted, exposing the interior Opal. These Opal-replaced fossil shells are RARE and formed 135 million years ago in the Bulldog Shale of Coober Pedy. Unfortunately, these specimens are virtually impossible to find on the market now as the area around Coober Pedy is difficult to mine since is no longer profitable or commercially successful for the effort required. A beautiful, fine quality and desirable example of these gorgeous pseudomorphs.

ex Brian Kosnar collection

Locality: Coober Pedy, Central North, South Australia, Australia

Specimen size: 3.7 x 2.6 x 2.2 cm (toenail)

Shipping from United States

Processing time

1-3 business days

Estimated shipping times

  • North America : 2 - 5 business days
  • Europe : 7 - 14 business days
  • Australia, New Zealand and Oceania : 10 - 20 business days
  • Asia Pacific : 7 - 14 business days

I'll do my best to meet these shipping estimates, but can't guarantee them. Actual delivery time will depend on the shipping method you choose.

Customs and import taxes

Buyers are responsible for any customs and import taxes that may apply. I'm not responsible for delays due to customs.

Payment Options

Secure options
  • Accepts Etsy gift cards

Returns & Exchanges

I gladly accept returns, exchanges, and cancellations

Just contact me within: 14 days of delivery

Ship items back to me within: 30 days of delivery

Request a cancellation within: 2 days of purchase

But please contact me if you have any problems with your order.

The following items can't be returned or exchanged

Because of the nature of these items, unless they arrive damaged or defective, I can't accept returns for:

  • Custom or personalized orders

Conditions of return

Buyers are responsible for return shipping costs. If the item is not returned in its original condition, the buyer is responsible for any loss in value.

Questions about your order?

Please contact me if you have any problems with your order.