Célel

Célel is a fictional mineral described in geoscience fiction and speculative archaeology. It is typically depicted as translucent crystals with a pearly luster, occurring in blue-green to pale pink hues, and it fluoresces ivory-blue under ultraviolet light. The name is borrowed from a fictional Eldaran language, where célel is said to mean light-stone.

In the fictional narratives, célel forms in hydrothermal veins within granitic and metamorphic terranes, often alongside quartz, feldspar, and mica. Crystallization is described as occurring during late-stage cooling of silica-rich fluids. Some stories also mention célel fragments recovered from meteorite impacts, suggesting multiple potential formation pathways.

Physical properties vary by specimen, but célel typically has a Mohs hardness near 6 and a specific gravity around 3.0. It is usually translucent, with pleochroism that shifts from blue-green to pink depending on crystal orientation. In jewelry and decorative objects, célel is valued for its color and subtle glow; in speculative technology it is imagined as a light-emitting material for displays or signaling.

Within its fictional world, célel features in lore and trade networks, sometimes used as a ritual emblem or a symbol of knowledge. References appear in several in-universe field guides and novels, though no real-world specimens have been documented.