I work at a daycare center, specializing in after school care. I lead the homework/acedemic portion of the program. After requesting parents to donate natural science specimens, I received this. I haven't a clue what it is, but assuming it is a tooth of some kind. It is rock-like without any enamel and seems to be light-weight and porous. What do you think?
Or is there a link to an online tooth identification key?