There is a great deal of different materias in the game. You got Magic, Support, Command, Independent, and Summon. Out of these what do would you think should be materia and is not?
Here are a few of mine.
(Magic Materia)
Liquid Materia : Water Water2 Water3
Wind Materia : Aero Aero2 Aero3
(Support Materia)
Aura Materia - Feels limit gauge when using paired materia.
Morph as Well - Morph Items when paired materia is used.
(Command Materia)
Scroll - Uses a random action (can cast magics, attack or summon)
(Independent Materia)
Break HP - New limit is 99,999
Break MP - New limit is 9,999
Break Damage - New limit is 99,999
(Summon Materia)
Summon - Eden : Same as in FFVIII