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A new mineral matching its unique chemistry - as described in the film Superman Returns - has been identified in a mine in Serbia.
According to movie and comic-book storylines, kryptonite is supposed to sap Superman's powers whenever he is exposed to its large green crystals.
The real mineral is white and harmless, says Dr Chris Stanley, a mineralogist at London's Natural History Museum.
"I'm afraid it's not green and it doesn't glow either - although it will react to ultraviolet li
Once the London expert had unravelled the mineral's chemical make-up, he was shocked to discover this formula was already referenced in literature - albeit fictional literature.