Eilime

Eilime is a fictional mineral described in speculative geology and worldbuilding literature. It is noted for its stability, unique optical properties, and potential technological roles within its imagined setting.

The name eilime is typically explained as deriving from the fictional Eil region, with the suffix -lime inspired by terms like luminescence or limestone. Some sources emphasize its luminescent character as a defining trait.

In most renderings, eilime is a dense silicate mineral with a hypothetical formula EiSi2O6. It is described as crystallizing in a mono- or polycrystalline form, having a high refractive index, and emitting a blue-green glow under ultraviolet light. Reported hardness is around 7 on the Mohs scale, with strong thermal stability.

Geologically, eilime is placed in deep crustal or mantle environments where high pressures and temperatures prevail. It is commonly depicted as forming in conjunction with olivine, magnetite, and perovskite, and as accumulating in vein-like deposits. No real specimens exist; eilime is a product of fiction.

Narrative and practical uses in fiction include energy storage systems, optical components, and gemstones. The imagined material serves as a plot element to explore resource management, advanced manufacturing, and the interplay between science and myth in its world.