Mace Windu's purple saber is said to be created by a purple Amethyst crystal. The idea of a purple lightsaber was actually created by the actor who played Mace Windu in Attack of the Clones, when he asked if you could wield a purple lightsaber during the final battle of the movie, so his character would be more visible. The most well-known purple lightsaber wielder in the Old Republic era was Darth Revan, and the most well known in newer lore is Mace Windu. In Knights of the Old Republic, characters could find purple lightsaber crytals in the tomb of Tulak Hord, in Tatooine's dune sea, and the remains of a Dark Jedi on Kashyyyk. Traditionally, in Old Republic lore, Purple (sometime called violet) lightsaber crystals were fairly uncommon, and mostly wield by Sith as an alternative to a red lightsaber crystal.
