Kryptonite on Earth (sans fluorine) = Jadarite

news.bbc.co.uk — The story has been floating around for a while now; here's the BBC version. Scientist checks out rocks; finds something new. Figures out chemical composition. Punches it into Google (of course) and comes up with kryptonite. This one's white and has no fluorine but is otherwise chemically identical to the kryptonite in Superman Returns. Feb 11, 2008 View in Crawl 4