Cljus

Cljus is a fictional material that appears in speculative fiction, tabletop RPGs, and some game lore. It is described as a versatile composite that blends crystalline ceramic with metallic phases to yield exceptional resilience and energy-handling properties.

The name Cljus is used across sources with varying origins; some authors treat it as a proper mineral name, others render it as an acronym. In-universe lore, the term has several claimed etymologies, but there is no canonical origin.

In most depictions, Cljus is characterized by high strength-to-weight ratio, excellent thermal conductivity, and resistance to radiation. Some variants claim self-healing microcapsules or tunable porosity for energy storage or catalysis.

Cljus is described as rare, found in deep geological formations on several moons and asteroids in the fictional setting. Extraction is complex, requiring specialized robotics and containment to avoid hazardous dust and reaction byproducts. Refining often involves high-temperature annealing and phase separation.

The material is used for spacecraft hull plating, heat exchangers, superconducting components, and armor. Its scarcity drives speculative markets and ethics debates about exploitation of off-world resources.

Cljus features in various series, games, and novels, with differing lore on origin and capabilities, sometimes leading to canonical conflicts between authors.