I found this in Mallorca in the summer holidays and if it is a fossil it is Neogene in age ( I think around 10 million years old.) At first, I thought it was just some kind of old pot, but when I looked inside I could see it looked natural made- not man made. The inside has a ivory texture, but it is definietly fully fossilised. Could it be the end of a mammoth/mastodon tusk which went inside the skull?
It is very different to any other fossil I found there. It has a very different texture and it looks like it has different minerals in it, which is why I think it could have come from Africa originally? Could it be turtle shell? It looks the right shape, but I'm not really sure