A newly discovered mineral has been found to contain exactly the same elements as the large green crystals that rob the superhero of his powers.
In the 2006 movie, Superman's arch-enemy Lex Luthor, steals a kryptonite rock fragment from the Metropolis Museum.
On the case are written the words "sodium lithium boron silicate hydroxide with fluorine".
Dr Chris Stanley, a mineralogist from the Natural History Museum, said: "Towards the end of my research, I searched the web using the mineral's chemical formula - sodium lithium boron silicate hydroxide - and was amazed to discover that same scientific name written on a case of rock containing kryptonite stolen by Lex Luthor.
"The new mineral does not contain fluorine and is white rather than green, but in all other respects the chemistry matches that for the rock containing kryptonite.
"We will have to be careful with it - we wouldn't want to deprive Earth of its most famous superhero."
The unusual mineral was unearthed in Serbia by geologists from the mining group Rio Tinto.
As it is unlike anything previously known to science, they enlisted the help of experts at the Natural History Museum.
Experts say that between 30 and 40 new minerals are discovered each year.