Kryptonite is no longer just the stuff of fiction feared by caped superheroes.
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.
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