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. The color range runs from deep indigo to violet, and the mineral is said to exhibit strong pleochroism depending on the viewing direction. Descriptions typically place its hardness in the moderate to high range among common silicates, with a density that sits in the mid-range for silicate minerals. Because kypsyneille is a fictional construct, specific numerical values for hardness, refractive index, or density vary by work.

Formation and occurrence, in the fiction, describe kypsyneille forming under high temperature and pressure in subduction-zone metamorphism or within hydrothermal veins. It is said to occur in remote regions such as the fictional Kypsis Range and in certain meteorite impact zones, where unique geologic processes are imagined to concentrate it.

In-world significance, kypsyneille is prized by collectors and craftspeople for jewelry and decorative inlays. Some narratives attribute metaphysical or energy-storage properties to the mineral, though such claims are purely imaginary and serve narrative purposes.

Etymology for the name is often imagined to derive from kypsis, a term in the fictional lexicon associated with concealment or hidden light, though different universes may offer alternate origins.