This is a fossil ammonite that was recovered from Cretaceous (approx. 66 to 145 million years ago) deposits in Madagascar. It has been partially prepared and shows some honey-colored, calcite replacement crystals. Preliminary ID for this specimen is Douvilleiceras sp.
Refer to the photo. The black centimeter cube is shown for scale and is not included. You are purchasing the specimen shown. Your purchase will include an ID label.