Revogueis

Revogueis is a rare mineral described in fictional exogeology literature. It forms in high-temperature, high-pressure metamorphic environments within ultramafic rocks and is noted for a reversible phase transition: when exposed to an external field (electric or magnetic), its crystal lattice distorts and, upon removal of the field, reverts to its original state. The memory effect makes revogueis a subject of study for adaptive optics and data storage concepts in the in-universe setting.

Discovery and naming are attributed to geologists L. Khatri and R. Voss, who identified the mineral in 2147 during prospecting on a storm-blanketed moon of Ardea. The name revogueis derives from a Latin root meaning to recall or call back, with a suffix that denotes a mineral class, reflecting its reversible lattice behavior.

Physically, revogueis is typically a dark olive-to-black mineral with a metallic to submetallic luster. It crystallizes in a tetragonal system and commonly occurs as intergrown grains in veinlets with olivine, magnetite, and chromite. It is moderately hard on the Mohs scale and has a relatively high density. It also exhibits a strong nonlinear optical response, including notable second-harmonic generation, and shows a pronounced memory effect under cyclic field exposure.

Occurrence and formation involve metasomatic alteration of ultramafic rocks under specific temperature, pressure, and fluid conditions, often in subduction-analog environments or planetary crusts with active tectonics. In the in-universe geology, revogueis remains extremely scarce and difficult to extract.

Potential applications discussed by researchers include programmable photonic devices, reversible data storage, and radiation-hardened electronics. Laboratory synthesis requires high-pressure, high-temperature methods or specialized transport techniques, which currently limit practical deployment.