Tegeusala

Tegeusala is a fictional mineral described in speculative geology and worldbuilding. It is defined as a rare phosphate-bearing silicate that, in narrative contexts, crystallizes in the monoclinic system and forms prismatic crystals. The name Tegeusala is a constructed term used to illustrate mineralogical concepts and is not recognized by major real-world databases or by the International Mineralogical Association (IMA).

Physical properties are described for pedagogical purposes. Tegeusala is depicted as pale green to emerald, transparent to translucent, with a vitreous luster. Its Mohs hardness is placed around 5.5 and its specific gravity about 3.2. Cleavage is described as poor in one direction, with an uneven fracture. In specimen reports, twinning and minor zoning may occur in larger crystals.

Occurrence and formation are outlined in fictional settings. Tegeusala is said to form in ultramafic metamorphic rocks through metasomatic alteration in fluids enriched with phosphate. It is typically described as coexisting with minerals such as olivine, magnetite, and amphibole, and its occurrence is often localized to the Theon Basin or analogous geologic contexts.

Classification and significance are framed for educational use. It is placed within the silicate minerals with phosphate components and is employed in teaching crystallography, mineral classification, and narrative worldbuilding. In real-world terms, tegeusala has no established mineralogical status or commercial applications, serving instead as a illustrative example of mineralogical concepts in fiction.