Dilithium

Dilithium (symbol Dl or Dt) is a chemical element, atomic number 119 on the periodic table. Dilithium, in its most stable form, has an atomic mass of 315, and was discovered by Humans for the first time on Amalthea, the fifth moon of planet Jupiter, in the year 2049. This crystalline element has qualities as a subspace amplifier, creating energy current when exposed to subspace fields. This material's crystal structure can be applied to regulate matter/antimatter reactions. Different compositions and origins produced slightly different appearances in the crystals, ranging in shape and color.

Behind the scenes
Assimilation² marks the DWU universe appearance of the Star Trek franchise's dilithium.