This is the only kind of radiation therapy I ever want to receive, that found in a gorgeous marble like this! While there are actually only unharmful trace amounts of radiation found in the UV 'vaseline' glass used in this marble, it is enough to light up like a Christmas tree when placed under a nice black light. Check out that glowing green glass, woohooo! This is the new best UV marble I've ever sold, SO awesome. And what's great about this hollow marble is that it looks really awesome even without the black light, in fact, much better in hand than what these pictures show. Don't miss out on this one!