In the Star Wars universe, Kyber crystals are rare, Force-attuned crystals that are used to power lightsabers and the Death Star's superlaser. The creation of Kyber crystals is not explicitly detailed in terms of elemental composition, as they are primarily depicted as naturally occurring minerals found on various planets.
The lore surrounding Kyber crystals suggests they are tied to the Force and possess unique properties that resonate with Force users. Their color often signifies the affiliation or connection of the Jedi or Sith who wield them, with different colors arising from the crystal's relationship with its user.
While the specific elements that make up Kyber crystals are not defined in canonical Star Wars materials, they are generally considered to be more mystical objects rather than substances that can be broken down into conventional chemical elements. Their significance lies more in their connection to the Force than in their material composition.