Kiillon

Kiillon is a fictional mineral that appears in speculative fiction, tabletop role-playing games, and various worldbuilding projects. It is not a real substance, and there are no verified occurrences in the natural world. In many depictions, kiillon is a crystalline or glassy material valued for a combination of luminescence and energy-related properties.

The name kiillon and its specific traits vary by setting, but common themes include photoluminescence, piezoelectric behavior, and high energy density. It is often described as fluorescing with a blue- or green-tinted glow when activated by electric, magnetic, or optical fields, and as capable of storing and releasing energy for use in devices, reactors, or spacecraft.

Appearance ranges from translucent to opaque, with colors such as pale blue, teal, or emerald in many portrayals. Physical descriptions of kiillon also vary, with some sources portraying it as moderately hard and brittle, while others depict it as unusually tough depending on its crystalline form and treatment.

In-world lore typically locates kiillon in rare deposits within asteroid belts, ancient ruins, or remote planetary veins. Extraction is frequently depicted as hazardous due to brittle crystal structure, reactive coatings, or ecological risks associated with mining operations. Economies within fiction sometimes treat kiillon as a luxury mineral, a critical energy resource, or a standardized medium of exchange in interstellar trade networks.

As a fictional concept, kiillon has no basis in real-world geology or chemistry. Its primary function is as a versatile worldbuilding element that authors and game designers adapt to fit diverse narrative needs.