I am the master of FF7

[Omnipotent Archmage]

ok, how many different pieces of materia r there?

There are sixteen regular summons, thirteen regular Support materia, thirteen regular Command materia, twenty-one regular Magic materia, seventeen Independent materia, Master Magic, Master Command, Master Summon, the four Huge Materia, the Black Materia, and the White Materia, for a total of eighty-nine.