Its like a clear marble with a rainbow type strip. No idea just thought it looked pretty cool. My shot in the dark would be Vitro and that is based on absolutely nothing.
I read on the forum that this is a slag marble (they took two and put them together). Is that accurate? I was going with a slag peltier here, any thoughts?
This one has thrown me off because of the shape. It looks like the indent comes from a pontil and the other side is flat. Cant' tell if its old or new.