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This is a very high quality 10.8" iridescent Placenticeras ammolite from the Bearpaw Shale formation in Alberta, Canada.
Placenticeras is a genus of ammonites from the Upper Cretaceous. This specimen is at least 66 million years old.
Ammolite is an opal-like organic gemstone. It is made of the fossilized shells of ammonites. This specimen shines mutliple hues of green, red, yellow, blue, and purple.