Matter Manipulation was a super power that allowed one to control matter. This was often a form of psychokinesis, although it didn't have to be. It could allow a person to manipulate matter at the molecular, atomic and even sub-atomic level. People who could manipulate matter to that degree were usually able to completely transform matter into whatever they choose. Firestorm for example, was able to transmute any form of matter into whatever he chose, unless of course it was organic matter.