Scientists have found a new mineral in a Serbian mine that matches the chemical features of the fictional Kryptonite:
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 light by fluorescing a pinkish-orange," he told BBC News.
More info at BBC News. Researchers decided to name the new mineral Jadarite. Jadar is the name of the place where the Serbian mine is located.