Hidden inside a diamond forged deep within the belly of the Earth, scientists have found the first evidence of a mineral that’s never been seen before.

It’s called calcium silicate perovskite, and without a hard casing like diamond, scientists have never been able to keep it stable at Earth’s surface.

“We actually had no idea we would find it,” said Graham Pearson, a professor at the University of Alberta and co-author on a new Nature paper that details the find.

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