Large Calliphylloceras Ammonite with Natural Iridescence – Cretaceous, Madagascar This impressive Calliphylloceras ammonite from the Cretaceous period showcases exceptional preservation and a striking natural iridescence. Under direct light, the shell reveals brilliant flashes of red, green, and blue, a highly desirable feature in ammonite specimens from Madagascar. The fossil displays the elegant coiling, intricate sutures, and fine structural details characteristic of the genus, all beautifully highlighted by a professional polish that enhances the clarity of the internal patterns and mineralization. A stunning fusion of scientific interest and natural beauty, this ammonite makes an outstanding addition to any fossil collection or a remarkable decorative statement piece. A rare and eye-catching specimen—both geologically significant and visually spectacular.