Diatium was a metal substance used in small power cells as early as four millennia BBY.
Lightsabers generally used cylindrical diatium power cells. It was not a very rare mineral, in that it was easy to mine for helpful use. Diatium power cells are capable of storing massive amounts of energy as lightsabers are rarely seen being recharged.
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- Star Wars: The Old Republic
- Cloak of Deception
- Dark Lord: The Rise of Darth Vader (Mentioned only)
- Star Wars: Empire 31: The Price of Power (Mentioned only)
- Star Wars Galaxies: An Empire Divided