Kyber Crystal

Kyber Crystals (Lightsaber Crystals) were immensely complicated crystals that had a connection with the force, and could use the force to release electromagnetic energy and in the form of a standing wave, which could be focused to form the "blade" of a lightsaber.

The ability of the crystals to derive energy from the Force was due to their immensely complicated chemical structure, which allowed them to interact with Vions, similarly to lifeforms.