Basalt was a rocky substance found on the planets Iego and Pamarthe. Many of Pamarthe's islands possessed basalt cliffs, with some featuring spaceports carved into them. Iego's surface was covered with basaltic spires, and many of those spires had cities, such as Cliffhold, built within them.
- Star Wars: The Clone Wars – "Mystery of a Thousand Moons" (First appearance)
- Thrawn: Treason (Mentioned only)
- (Slide 6) (First identified as basalt)