larminë

Larminë is a fictional mineral commonly described in fantasy and speculative fiction as a luminescent stone that stores and releases energy as light. In many worldbuilding traditions, it powers lamps, runes, and other devices that require a portable light source.

Etymology: The name arises from a constructed language used by several mountain cultures in worldbuilding; its components are interpreted as meaning light and stone.

Physical properties: Larminë crystallizes in prismatic crystals, typically pale blue to green, and glows faintly in darkness. It has a hardness of about 6 on the Mohs scale and a density around 3.2 g/cm3. It is photoluminescent, recharging under daylight or artificial light, and remains stable up to roughly 900°C in air.

Formation and distribution: It forms in hydrothermal veins and metamorphic rock associated with quartz and magnetite. Rarity varies by region, with the stone most commonly reported in remote highland belts and volcanic districts.

Uses and cultural significance: In fiction, larminë powers luminal devices such as lamps and sigils, and is used decoratively in jewelry. Its scarcity and glow have made it a symbol of knowledge and endurance in several cultures, and it has historically influenced trade routes and local economies within story worlds.

In fiction and scholarly treatment, larminë is treated as a central worldbuilding element with pseudo-scientific properties to support lore, without a real-world counterpart.