lumnereth

Lumnereth is a fictional mineral noted for intrinsic luminescence. In speculative fiction and world-building, it is described as forming in hydrothermal veins within volcanic rocks and emitting a continuous glow after exposure to light.

The name combines lumen from Latin “light” with a coined suffix -ereth, intended to evoke brightness. It appears in modern fantasy and science fiction lexicons as a notable mineral resource within various fictional settings.

Chemically, lumnereth is described as an iron-silicate matrix with trace rare earth elements. Crystals are typically monoclinic, prismatic, and reach several centimeters in length. In daylight it is pale or colorless, but under ultraviolet light it emits a blue-green glow that can persist for seconds after exposure. Hardness is often placed around Mohs 6–7.

It is said to form in high-temperature, low-oxygen hydrothermal environments associated with basaltic volcanism. It is most commonly reported in the fictional Luminal Rift and is frequently co-located with quartz and magnetite.

In fiction, lumnereth is valued for signage, decorative jewelry, and potential photonic sensors. Some in-world research posits photon-trapping properties that could enable simple energy storage, though such capabilities are speculative and vary by author.