Crystals of varpeline represented a particular type of kyber crystal found on the Outer Rim Territories planet of Mearalis II. Because of their exceptional hardness and density, these crystals found utility in industrial applications, specifically in cutting machinery. Furthermore, varpeline crystals had the potential to function as lightsaber crystals. Lightsabers utilizing varpeline crystals emitted a distinctive, high-pitched sound upon impact and demonstrated an enhanced ability to slice through exceptionally durable materials compared to lightsabers with other crystal types.