The “gem” of an ammonite dates back 71 million years, and comes with a curious coating of ammolite, giving it a dazzling rainbow iridescence. “A 'Gem' Ammonite in Matrix from the Bearpaw ...

In fact, iridiscent opalized ammonites are so striking that they have their very own mineral name: ammolite. Ammolite is biogenic gem material primarily found in Alberta, Canada. However ...

Ammonites were shelled cephalopods that died out about 66 million years ago. Fossils of them are found all around the world, sometimes in very large concentrations. The often tightly wound shells of ...