Forum:Violet Crystals and Ilum

If Violet crystals {the kind which Mace Windu uses} were so rara, then how come they were on Ilum? If you watch Clone Wars Vol. One, Chapter 14, you can clearly seee that there are violet crystals. Why don't more Jedi of that time period use these crystals?--Jedi Kasra 16:27, 20 June 2007 (UTC)