Petra is a mutant introduced in X-men Deadly Genesis a part of Professor X's 2nd team of X-men, which was recruited to save his original team.

Petra was a powerful geomorph and used her abilities to crush coal into diamonds and survive on the streets, as her family was tragically buried in an avalanche that may have been caused by the onset of her mutant powers. Eventually she learned to use her abilities offensively and defensively by controlling the ground around her. She seemingly met her unfortunate end along with the rest of Vulcan's team.