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Super smooth inside and slightly rougher outside yet still smooth rough natural exterior with Mother of Pearl rainbow-shine included free of charge🌈 ✨ Perfect pieces to wire wrap! These Fossilised Ammonites are from Madagascar and lived in the Cretaceous Period. They are between 135 and 395 Million Years old Ammonites are part of the Cephalopod genus. They were marine animals living in the sea, millions of years ago. Highly mobile swimmers and generally carnivorous, they could adjust their buoyancy by means of a chambered shell, changing the air pressure in these chambers using a tube linking the chambers called a siphuncle. Perhaps Ammonites were the ancient equivalent of the modern 'scuba diver'! 🫧 🐚