Mirkanite

Mirkanite was one of the valuable minerals found in the lava of the planet Mustafar. Huge potential profits had spurred mining operations on the volcanic world, despite the safety risk.

It was also a substance commonly used in the construction of superlasers; the Galactic Empire tapped the planet for its resources during the construction of the first Death Star.

Rianna Saren, a mercenary with the Alliance to Restore the Republic, destroyed the Mirkanite Mining Facility on Mustafar during her mission to gather information on the Death Star for the Rebellion.

Text and facts from the “Mirkanite/Legends” article on Wookieepedia, licensed under CC BY-SA 3.0. Modified for this site.