Reeglites

Reeglites are a fictional mineral described in speculative geology and science fiction; the term is not used in real-world mineralogy. The name is attributed in various world-building sources to an imagined researcher, Dr. Aric Reeg, who is said to have first described the mineral.

In these settings, reeglites form in crustal environments where rare-earth elements are concentrated, commonly in pegmatites and metasomatic zones. Fluids carrying lanthanides are imagined to be incorporated into a silicate lattice, yielding a mineral with significant rare-earth content. The resulting composition is described as variable, depending on the specific story or guide, with notable enrichment in rare earth elements such as cerium, europium, and neodymium.

Physical properties of reeglites are depicted as variable but generally consistent with a hard silicate mineral. They are often described as hard (on the order of Mohs 6), with a vitreous to glassy luster and colors ranging from emerald green to deep red or orange. They are typically opaque to translucent and occur as tabular or prismatic crystals; sources differ on the crystal system, listing monoclinic or tetragonal variants in different narratives. Specimens are usually depicted as forming in radiating or blocky aggregates.

Uses and significance in fiction center on reeglites as valuable gemstones and as potential sources of rare-earth elements for imagined technologies, including luminescent applications or energy-driven devices. In real geology, reeglites have no standing as a recognized mineral, but they appear in world-building guides and speculative discussions as a plausible fictional mineral concept.