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Ammolite comes from the fossil shells of the Upper Cretaceous disk-shaped ammonites Placenticeras meeki and Placenticeras intercalare, and Baculites compressus. They were cephalopods, or squid-like creatures, that thrived in tropical seas until becoming extinct along with the dinosaurs at the end of the Mesozoic era. made of the fossilized shells of ammonites,composed primarily of aragonite with minor amounts of calcite, pyrite, silica.It is a biogenic gemstones; others include amber and pearl.