The Nak'tra crystal was a type of crystal found in the Myyydril Caverns on the Wookiee homeworld Kashyyyk. The Myyydril tribe maintained crystal gardens to use the harvested crystals in their crystal rifles and other weapons. Nak'tra crystals could also be used to create a Jedi lightsaber. Because of their use, "Nak'tra" was a Myyydril word meaning "deadly".
These crystals were a prized material for weapons and were worth many credits. They were sometimes found in the stomachs of slain Urnsor'is.
Nak'tra crystals appeared in the video game Star Wars Galaxies, a massively multiplayer online roleplaying game developed by Sony Online Entertainment and published by LucasArts, prior to its closure on December 15, 2011.
- The Complete Star Wars Encyclopedia