Ghostfire crystal

Ghostfire crystals were a type of rare and entirely transparent kyber crystal that grew from rocky foundations and formed precarious and nearly invisible spires of stone. They could be found on a handful of worlds in the Outer Rim Territories and most commonly appeared on mountain peaks. A single ghostfire crystal was worth 14,000 credits.

When the crystals could be located, they could be used in the creation of lightsabers to produce a blade that was dim and translucent compared to the iridescent blades of other sabers, making it as difficult to detect as the crystals themselves. Lightsabers with ghostfire crystal cores also generated almost no sound and produced illusory afterimages of the blade that followed the motions of the wielder, the most curious effect of all which disguised the true position of the blade while also disorienting foes.

Text and facts from the “Ghostfire crystal” article on Wookieepedia, licensed under CC BY-SA 3.0. Modified for this site.