Thanks guys I just didn't want to say it felt like stone and be wrong but it's heavy and don't feel like my other clay marbles.. All I know is it's a awesome find that is two in a three ft radius now could be a few more there I just have to find them
I imagine Indians may have used them for something. Years ago the bigger ones where used to get chickens to lay eggs in nest boxes. And kill egg eating snakes so I have read.