Over the weekend I indulged in a bit of shopping and picked up these two fossilized ammonites from Michael Goettsch of Artifacts of Time. On the left is an opalized ammonite from Morocco; the photo doesn’t do justice to the depth of the coloration it has. Its companion on the right is a pyritized ammonite from the Ural Mountains, a lesser-seen sort of fossil. Both of these were formed when their respective minerals trickled into the decaying shell of the deceased ammonite and replaced its molecules.
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