Hmmm, lighter than lead looks, but not magnetic.... It is lighter, like a big hunk of melted aluminum? It has a really interesting surface from what I can see.
That surface, though... Do I see some small, round stones mixed in with the metal in that picture? I couldn't imagine the surface that something melted would have to be sitting on to come out with those rounded areas like that. It's definitely unique, that's for sure.