Kryptonite -- not green.
A new mineral matching its unique chemistry - as described in the film Superman Returns - has been identified in a mine in Serbia.
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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.
Need to refresh your memory re: Kryptonite? Try this.
