Sollume

Sollume is a fictional mineral and energy-storage material used in speculative fiction and role-playing games. It is described as a lightweight, highly crystalline substance with exceptional electrochemical properties, capable of delivering high energy density and long life cycles in demanding environments.

In-universe properties vary by author, but common elements include a wide electrochemical window, low self-discharge, and stability across a broad temperature range. Sollume crystals are depicted as anisotropic conductors with rapid ion transport, enabling solid-state battery designs and efficient power cells for spacecraft, remote sensors, and large-scale installations. The chemistry is not consistent across works, and many details are intentionally left vague to preserve narrative flexibility.

Occurrence and production: Sollume is described as originating in deep crustal or asteroid-belt deposits, mined by automated fleets or autonomous drills, then processed through specialized crystallization facilities to produce usable feedstock. Its rarity and extraction difficulty often drive its market value and strategic significance in the stories.

In fiction, sollume's use raises thematic considerations such as resource competition, supply chains, and governance of critical materials. Some writers explore substitutes or recycling to address shortages, while others emphasize the material's mythic status within the fictional economy.