Plutonium Rock[]
There used to be a humorous comment about this ore but Zeme removed it because he has no sense of humour whatsoever. Every 100 Plutonium Rocks makes 1 Plutonium Blocks.
Plutonium can be found in the following systems (incomplete list)
Trailian Minor
Trailian Major
Plutonium Block[]
Used in:
Fusion Power Module
Capacitor
Reactor Factory
Generic R2
Peonese Plus
Hyperdrive