Arsyetimit

Arsyetimit is a fictional mineral described in speculative mineralogy and science fiction contexts. It is defined as a rare, complex arsenide-silicate phase that purportedly incorporates yttrium and other trace elements. The name combines roots related to arsenic and yttrium, and its status as a named mineral is not recognized in formal mineral nomenclature.

Composition and structure in literature and worldbuilding descriptions treat arsyetimit as a solid solution between an arsenide-rich end-member and a yttrium-rich silicate. Proposed or imagined compositions range from (Y,As)Si2O7 to As3Y2Si4O14, with possible trace elements such as titanium, iron, and calcium. Crystallographic classifications vary, with speculative assignments including monoclinic or orthorhombic systems. Physical-property expectations commonly include a high hardness, a metallic to submetallic luster, and a relatively high density, though exact values are variable across sources.

Occurrence and formation are described in fiction and hypothetical models as conditions that mimic extreme crustal or mantle environments. In these accounts, arsyetimit would form through metasomatic reactions between arsenic-bearing fluids and yttrium-rich silicates under high temperature and pressure. To date, there are no verified natural samples or laboratory syntheses accepted by the scientific mineralogical community.

Etymology and classification notes emphasize its status as a speculative term rather than an established mineral. As a tool for worldbuilding and theoretical discussions of phase equilibria and trace-element behavior, arsyetimit serves to illustrate how complex arsenide–silicate phases might behave under extreme geological conditions.