A form of Lithium that is very important to constructing Star Ships.
Lithium Crystals are a form of Lithium used to control and regulate the intense power that comes from a Star Ship's Energy Core. Without them, the ship could not hope to use its reactor's power without blowing up from the raw Plasma.
There are however, Control Crystals that can be used for similar purposes.
They technically qualify as Energy Crystals and are rather rare, usually being 'grown' on farms. In placed where they are found in mass, such planets are usually very inhospitable
- Based on the Lithium Crystal of TOS Star Strek