Permafrost crystal

The Permafrost crystal was a rare lightsaber crystal found on the planet Hoth. When used in a lightsaber, it gave the blade an icy blue color. During the Galactic Civil War, one of these crystals was in the possession of the township of Aurilia on the planet Dathomir. It was awarded to a spacer who was a key asset in the Battle of Hoth.

Properties
The Permafrost crystal was a deep, icy blue, a trait it passed onto the blade color of the lightsaber it was used in. When tuned by a Force-sensitive for use in their lightsaber, it became a focusing crystal and could only be used in that individual's lightsaber. The only known source of these rare crystals was the planet Hoth, though how they were created was not known.

History
Some time during the Galactic Civil War, a permafrost crystal became the property of the township of Aurilia. It was awarded to a spacer who was instrumental in the Battle of Hoth.

Behind the scenes
Permafrost crystal is a unique lightsaber crystal in the 2003 MMORPG Star Wars Galaxies: An Empire Divided developed by Sony Online Entertainment. It was added to the game on November 20, 2008. Permafrost, like all blue crystals in the game, causes the player's lightsaber to deal additional cold damage when used. The vagueness of its history is due to that, even though players may take part in the Battle of Hoth in game, they may choose to fight on the side of either the Galactic Empire or the Rebel Alliance, after which players may purchase the crystal for fifty "Echo Base Tokens of Heroism", which players can get a maximum of nine for each flawless completion of the battle. Additionally, while players may participate in the Battle of Hoth, the game's timeline is not moved up to when the battle occurred. The crystal appears as an "Item" card in the Star Wars Galaxies Trading Card Game set, The Nightsister's Revenge.