Yiwus

Yiwus is a fictional mineral described in speculative fiction and worldbuilding materials. It is a rare silicate mineral noted for its blue luminescence and high thermal stability, properties that have made it a subject of study in in-world geology and technology.

Etymology and naming: The name derives from the Eldrian language, where yiwus roughly means light-stone.

Discovery and classification: First described in 2149 by expedition leader J. K. Aram during surveys of Eldoria's southern volcanic belt. Later references by the Studium of Aethon formalized its classification as a silicate mineral with luminescent properties.

Physical properties: Crystals are typically prismatic, colorless to blue; Mohs hardness 6–7; refractive index around 1.75; luminescence under ultraviolet light is intense and stable. The composition is described as yttrium-rich silicate with trace elements such as zirconium and europium, though precise formulas vary by deposit.

Occurrence and distribution: In the fictional world, Yiwus is found mainly in hydrothermal veins within basaltic rock on the Sendar archipelago and in subterranean belts in the Verdan plateau. It is considered rare and valuable.

Applications and cultural significance: Yiwus is sought for photonic devices, high-temperature sensors, and jewelry in in-world economies. In some narratives, its luminescent properties enable compact light sources and diagnostic materials for energy systems. Its rarity and beauty have made it a symbol of endurance in Eldrian culture.

See also: fictional minerals, Eldoria, photonic minerals.