The minrial found in a cave in Rio Tinto in 2007 called Jadarite with the compostion exact composition as Kryptonite reffered in DC Comics continuesly as Green Crystlas fromed form the destruction of the planet Krypton in superman comics and is radioactive to superman but the Jadarite looks more like white chalk but it is a crstal exceptit is'nt green. But i believe it already had a name when it was found "KRYPTONITE" even when the man who found it when he lookd it up on the web it came up as kryptonite. for us superman fans this was the closes we came to superman being real and no one will know what it is by its falsly given name for supeman fans this is just screwed please sign off on this Please.