Phemis was the only planet where rubat crystals could be found, historically used by the Jedi Order to craft lightsabers during the Old Republic. The planet is only sparsely inhabited, with a population of 10,000, largely made up of mining settlements and a military garrison.
Phemiss was first discovered by Corellian explorers early in the history of the Old Republic. However the Jedi Order had long mined the region for rubat crystals, and had the senate declare the crystals a protected resource, limiting future colonisation and mining efforts. During the age of the Galactic Empire, the ban was reaffirmed and possession of the crystals was made illegal.
- Knights of the Old Republic II: The Sith Lords: Prima Official Game Guide
- The Complete Star Wars Encyclopedia
- Hidden Depths