Lantharna

Lantharna is a fictional mineral that appears in fantasy literature, role-playing games, and related media. In most uses, it is described as a transparent to translucent crystal known for faint permanent luminescence and a capacity to store or convert energy. The name is often treated as an in-world term derived from a root meaning “to shine,” with various languages adding suffixes to create related terms such as lantharn or lanthar.

Occurrence and origin: In narrative settings, lantharna forms in deep crustal veins with high mineral diversity, typically in volcanic or tectonically active regions. In some sources it is associated with ancient dwarven or scholarly civilizations and is mined in rugged quarries or mountain caves. Its exact origin varies by world-building tradition, but its glow is usually tied to a historical or ritual significance.

Properties: Lantharna crystals range from colorless to pale blue or violet and emit a soft glow in darkness. In-universe chemistry is fictional, but authors commonly describe lantharna as a lanthanide-like silicate or a mineral with luminescent centers. The material is moderately hard (roughly 6 on the Mohs scale) and thermally stable, though surfaces can craze if subjected to rapid temperature changes. Exposure to concentrated energy sources is sometimes said to alter its glow or color.

Uses and significance: Lantharna is often used as an illumination source, decorative or ceremonial stone, and, in some settings, as a component of energy storage or magical catalysts. Its scarcity and glow make it valuable for guilds, temples, and engineers, and it features prominently in legends about celestial events and city founding.