Kunda Stone
this unusual form of crystalline mineral was found on the planet Kadril. It was collected and used in a variety of communications, power, and medical technologies. The ancient Jedi Knights sometimes used kunda stones as the material for the emitter lenses in their lightsabers. One of its unique properties was its ability to absorb and filter out the gas known as pacifog. For this reason, Darth Vader ordered huge quantities of kunda stones from Dal Quirz, for use in manufacturing filter masks for troops which would deploy pacifog. It was then that Lon Prador revealed that Kadril itself was made up of natural kunda stone