A Luxum crystal represented a specific variety of crystal suitable for use in the creation of a lightsaber. Originating from the dark energy-laden planet of Ambria, these crystals were created via extensive meditation, combining minerals and Force energies found within Lake Natth. When incorporated into a lightsaber, Luxum crystals enhanced the weapon's effectiveness against droids by giving the blade an ion effect. These crystals were among those desired by the fugitive Jedi, Jax Pavan, as he sought a mineral to replace the lightsaber he lost in combat against Darth Vader.