Vasslen

Vasslen is a rare mineral noted for its metallic luster and blue-green translucence. First described in the eastern valleys of the fictional continent Eldoria, it forms under high-temperature, high-pressure conditions typical of subduction-zone metamorphism. Crystals are usually small, often forming in vein-like aggregates within serpentinite and chlorite-rich rocks. The mineral crystallizes in a monoclinic system and can exhibit pleochroism, appearing different colors from different angles. Chemically, vasslen is a complex silicate containing iron and vanadium, with variable amounts of magnesium and aluminum that produce several subtypes. Its exact composition varies by deposit, influencing both hardness and color.

Vasslen deposits are rare and occur in remote regions, making mining sporadic. The material is valued for a favorable strength-to-weight ratio, good high-temperature stability, and distinctive optical properties, which support its use in ceramic coatings, specialized crucibles, and decorative inlays. In jewelry, small crystals are cut to highlight color and internal glow.

Deposits are typically managed by regional mineral councils in Eldoria, with export controlled to promote sustainable extraction and prevent supply disruption. Research on vasslen focuses on crystallography, thermomechanical behavior, and potential catalytic or electronic applications, though practical uses remain niche.

See also: fictional minerals, Eldoria geology, subduction-zone metamorphism.