This Specimen has been sold.
Iridescent Cleoniceras Ammonite Fossil
Here's a beautiful silver iridescent fossil from Madagascar. It is of the species Cleoniceras besaiei which inhabited the shallow seas nearly 110 million years ago. Not only is it interested from a natural history perspective but it is very aesthetic also.
Ammonites were predatory mollusks that resembled a squid with a shell. These cephalopods had eyes, tentacles, and spiral shells. They are more closely related to a living octopus, though the shells resemble that of a nautilus. Ammonites appeared in the fossil record about 240 million years ago and they barely survived several major extinction events. The last lineages disappeared 65 million years ago at the end of the Cretaceous.