My best friend gave me this fossilized bone that one of his grandparents gave him when he was a kid, but neither of us knows what it is. It appears to be part of some sort of joint, like a knee or ankle, but I don't know for sure. I also have no idea what kind of animal it belonged to, so that makes it even harder to identify. I really love it, though. It's a lot lighter than it looks like it should be, and the smooth grooves on one side are the perfect size and shape for my thumbs. It just feels really nice and calming in my hand for some reason. I've been carrying it around in my pocket for that reason. Anybody have a clue what it is or might be?