kypsyneille
Kypsyneille is a fictional mineral described in speculative fiction and worldbuilding contexts. In these sources it is presented as a rare silicate mineral valued for its striking color and optical properties.
Physical properties commonly attributed to kypsyneille include hexagonal crystal habit with a vitreous to adamantine luster.
Formation and occurrence, in the fiction, describe kypsyneille forming under high temperature and pressure in subduction-zone
In-world significance, kypsyneille is prized by collectors and craftspeople for jewelry and decorative inlays. Some narratives
Etymology for the name is often imagined to derive from kypsis, a term in the fictional lexicon