Suline

Suline is a fictional chemical element and mineral described in speculative science literature and thought experiments. In the imagined framework, its chemical symbol is Su and its atomic number is 126. It is depicted as a soft, dense metal with a silvery-blue luster and very high electrical conductivity, approaching that of copper, along with notable thermal conductivity. Some portrayals claim suline can exhibit superconductivity at low temperatures and shows radiation resistance superior to many transition metals.

Suline compounds include sulfides and halides; it forms stable sulfide minerals under reducing conditions and can participate in intermetallic alloys with light elements such as lithium and boron. In air, suline is said to slowly form a thin oxide layer, which can alter surface properties over time. The element is often described as highly reactive with certain nonmetals, while remaining relatively stable in inert environments within the narrative.

Occurrence and production in the fictional universe place suline primarily in ultramafic igneous rocks and rare belt-like deposits found on the outer regions of planetary systems or in deep-crustal settings of certain moons. Mining is portrayed as technically challenging due to the material’s high density and tendency to crystallize in soft, malleable forms. Industrial production is described as involving high-temperature electrochemical reduction of sulfide concentrates, followed by purification methods such as zone refining.

Applications within the stories include use in high-performance alloys for aerospace, components for energy transmission in superconducting grids, and as catalysts in hypothetical reactions requiring extreme thermal stability. Safety notes in the fiction warn that suline powder can be hazardous if inhaled or ingested, with potential irritation and longer-term toxic effects in some depictions.