Kryptonite is an fictional substance and is the remains of Krypton, Superman's native planet that blew up. It is glowing green in colour and is one of Superman's weakness - it robs him of his superhuman strength.
The chemical composition of Kyrptonite is supposed to be "sodium lithium boron silicate hydroxide with fluorine." (from the 2006 movie "Superman Returns").
Well they have discovered a new mineral with the exact chemical composition in Siberia. However, it is white in colour, not radioactive and does not contain fluorine. They have named it Jadarite and not Kyrptonite. I am not joking.
Read the article on the Discovery site here.
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