- "Exonium's no hollinium, but it's worth a few credits."
- ―An exonium prospector
Hollinium was a valuable and extremely heavy elemental metal ore that was used in the creation of synthetic hyperbarides; it was considerably more valuable than exonium. It had a compound, hollinium chloride, that formed on Goroth Prime. One hundred grams of hollinium hyperbaride was used by Urias Xhaxin to buy the Free Lance.
- Star Wars: The Old Republic: Rise of the Hutt Cartel
- Star Wars: The Old Republic: Shadow of Revan (Mentioned only)
- Star Wars: Clone Wars Adventures video game
- Star Wars Galaxies: An Empire Divided
- Legacy of the Force: Inferno
- Goroth: Slave of the Empire
- Pirates & Privateers
- The Complete Star Wars Encyclopedia
- Lords of Nal Hutta