bionerd23 | uranium ore + nitric acid = uranyl nitrate @bionerd23 | Uploaded April 2010 | Updated October 2024, 1 hour ago.
this video tells you how to turn a black lump of pitchblende into a green fluorescing mass. =)

warning - concentrated nitric acid is one of the strongest acids in the world. touching it can lead to severe injuries, and it easily reacts to form poisonous gas.
make sure you know how to handle and neutralize it as well as discard of the mess you made if you decide to handle it.