Marvel: Transmutation

Thomas Jones (Alchemy)
He has the ability to alter the chemical composition of anything he touches into its elemental components. He can also change matter into other forms so long as he fully understands the physical composition of the desired result. In his first appearance, he could only change objects into simple chemical elements, usually gold. Due to his study of biochemistry, he can now also change objects into more complex molecules, allowing him to change transmuted living beings back to normal.

Tomi Shishido (Gorgon)
Gorgon's primary mutant ability is the power to transform anyone that made direct eye contact with him into stone, similar to Medusa from ancient Greek mythology.