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X-Men:Deadly Genesis #1
Not wanting to be placed in another home, Petra became a runaway. She began manipulating nearby caves to provide her with a safe and secure hiding place. At 16, she discovered she could turn coal into diamonds. She found a pawnbroker to sell to. One day, the pawnbroker made an excuse to call the shop owner, causing Petra to flee. She woke up in a holding cell, where she was told she had a visitor. This visitor had dropped all charges and convinced the authorities to release her in her care. This visitor was Moira MacTaggert.She eventually joined the newly formed X-Men who were sent to Krakoa to resuce the missing members of the original X-Men team. She was killed during the mission, but her actions saved Darwin and Vulcan.