Ftestin

Ftestin is a fictional mineral described in a hypothetical mineralogy reference. It is named after the fictional mineralogist F. Testin and is cited as a rare telluride discovered in the Silvershaw district. The mineral is described as a telluride consisting primarily of iron, titanium, and tellurium, with trace nickel and sulfur. The approximate chemical formula is Fe2TiTe4.

Crystal structure and properties: Monoclinic; hardness 6.0–6.5 on Mohs; specific gravity 5.2–5.6; color steel gray; luster metallic; opaque.

Occurrence and formation: Reported from hydrothermal veins within ultramafic rocks in the fictional Silvershaw Range at depths of 1.5–4.5 km; forms under high-temperature conditions; associated minerals include pyrrhotite, magnetite, and bornite.

Discovery and naming: First described in 2122 by the fictional mineralogist F. Testin; named in their honor.

Applications and research: Potential thermoelectric material due to telluride content; studied for magnetic properties; in a fictional context, serves as a case study for telluride minerals and their practical challenges, including synthesis, stability, and economic viability.