Vionium is an extremely dense gray material which fluoresces brightly under ultraviolet light. 

It can be activated to produce a wide variety of energy forms - light, heat, X-rays, and subspace pulses.

Certain species, such as the Harelians, initially use vionuim as a power source for their colonies until more effecient fusion generators can be brought it. 

In 2371 a group of Harelians working for the Tal Shiar were pretending to be vionium miners as a cover.  ("Shakedown Cruise")

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