Green Materia is an enemy in Crisis Core -Final Fantasy VII-. It usually appears a group with another Materia.
It has high Vitality and Spirit and so strong command materia, such as Assault Twister+ or Costly Punch, work well.
The Materia in the Cage of Binding have a seemingly guaranteed drop of a Phoenix Down if the player does not have any in their inventory. This makes them the one of only two unlimited sources of Phoenix Downs, the other one being the superboss, Minerva.
Materia means "matter" or "substance" in Latin, Spanish and Italian; it also means "subject" in Italian and Spanish, and is the ascendant of Portuguese "Matéria".