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Gem ammolite in a mineralised ammonite!
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Not quite! Not all ammonite shells permineralize and develop into ammolite (which has this iridescence) during the fossilisation process, though I think it’s only known to occur with ammonites.

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This one sold at auction for just over $200kUSD, it’s estimate was 120k-180k

Edit: currency

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I believe this species had quite a narrow profile! Placenticeras meeki

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It was on display at Sotheby’s NYC before going to auction

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This is a Bearpaw ammonite!

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2 years ago