Various types of Materia appear in the game. Materia can be divided into five groups based on their Abilities.
Purple Materia. This enhances the characters' Status, such as maximum HP and strength.
Blue Materia. This Materia shows full effect when used in conjunction with other Materia, such as "All" or "Elemental". Make sure you insert this Materia in linked slots (either slot is OK) when equipping this Materia in a weapon or armor. Insert Command Materia or Magic Materia in the other slot. The effects of these Materia will be enhanced with Support Materia.
Yellow Materia. This will increase the number of commands that can be used during battle, such as "Steal" and "Throw".
Green Materia. This will enable you to use Attack Magic and Curative Magic.
Red Materia. This will enable you to cast Summon Magic during battle, in order to call a Summon Monster.