Purple Materia listing

Resistant- Provides bonuses to saving throws
Deflect- provides deflection bonuses to AC
Boost- Provides a +2 bonus to one stat (buy all 6!)
Fleet-Enhancement bonus to speed.
Stoneskin- Natural armor bonus.
Skill Boost- Boosts a skill
Razorsharp- Increases crit range (cannot purchase)
Hardy- Increases hit points
Dodge- Provides dodge bonus to AC
Throw- provides the benefit of Throw Anything
Omnislash- Provides the benefit of Combat Reflexes

Purple Materia listing

Jenova's Witnesses Baronbloodbath