Marionium, in conjunction with petonium, formed a primary export commodity from the planet Sunspot.
On the planet Sunspot, marionium was regarded as the most volatile element ever found, possessing a metallic composition. Marionium, alongside petonium, was extracted from the mines located within the Ran Dan's Folly settlement.
During the year 25,793 BBY, within one of these mining tunnels, a marionium cube was utilized by Stargazer Dalien Brock to energize the Gree device using dark matter. His intention was to activate the device and subsequently launch a Gree Hypergate within the Old City of the planet Tython.