Large Cleoniceras ammonite from the Cretaceous period, featuring exceptional natural iridescence with brilliant flashes of red, green, and blue visible under light. Originating from Madagascar, this specimen displays the characteristic coiled structure and fine ribbing typical of the genus, preserved in remarkable condition. A beautiful and authentic fossil that combines scientific significance with natural aesthetic appeal, ideal for collectors or as a striking decorative piece. Supplied with a clear acrylic stand for display.