Rubindium

Rubindium is an element found in crystalline form, used in subcutaneous transponders and could be used to emit a powerful laser beam.

While Captain Kirk and Spock were imprisoned on Ekos in 2268, Spock used rubindium crystals from the transponders implanted in their arms to improvise a crude, makeshift, and primitive laser cutting torch to escape. 

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Rubindium Rubindium