Klessast

Klessast is a fictional mineral that appears in science fiction and worldbuilding literature. Descriptions vary across sources, but it is commonly depicted as a dense, crystalline material with exceptional energy-related properties. Because it is a fictional construct, there is no single canonical definition.

Etymology and naming: The term klessast originates in constructed languages used by different authors. Some glossaries interpret the word as a compound meaning “stone of light” or “fuel stone,” while others treat it as an invented label without a fixed etymology.

Physical characteristics: In many depictions, klessast is hard and brittle, with high thermal conductivity and strong radiation resistance. It often glows or phosphoresces under certain wavelengths and has a refractive appearance. Its claimed chemical makeup is intentionally variable, with some sources ascribing it to mixed alloys and others to an exotic mineral phase; no universal chemistry exists.

Occurrence and mining: Klessast is typically described as forming in extreme geologic environments, such as deep crustal veins, hydrothermal systems, or asteroid interiors. Extraction is hazardous due to brittle fracturing, sharp shards, and, in some stories, radiological or toxic hazards. Access to klessast is sometimes regulated by governments or mining consortia.

Applications and role: The most common in-fiction use is as a high-capacity energy medium, enabling advanced propulsion, weapons, or shielding. It also serves as a cultural or political symbol of scarcity and technological edge. The resource frequently drives trade, conflict, and exploration narratives in speculative settings.

See also: Unobtainium; Vibranium; Energy mineral.