Tungsten

Tungsten, or Tungstate, is a metal added by and, as well as. Tungstate is the raw form of Tungsten, and must be purified before being used.

RedPower 2
Although Tungsten is generated, it has no uses inside RedPower 2, due to Eloraam planning ahead to generate all the ores that would be needed in the future and then never finishing the mod, therefore never giving Tungsten a use.