luisto
Luisto is a mineral described in geological literature as a rare silicate with notable luminescent and tactile properties. In the conventional fictional setting, the name derives from the Luisto Archipelago, the region where the mineral is first reported to occur. According to the narrative, luisto forms in hydrothermal veins associated with ultramafic rocks, under conditions of moderate temperature and elevated pressure.
The term was introduced by field researchers in the archipelago during expeditions in the late 20th century
Distribution is constrained to deep hydrothermal veins in the archipelago, though speculative notes in the literature
Uses and cultural significance: in the fictional setting, luisto has been used for personal adornment and ceremonial