Sivureitit

Sivureitit is a term used in mineralogy and speculative fiction to describe a hypothetical metallic silicate mineral distinguished by a bright, silvery-gray body color and a vivid iridescent sheen that shifts with viewing angle. In fiction, it is often portrayed as forming under specific high‑pressure, low‑temperature transitions in ultramafic host rocks; in scientific discussions, it is treated as a conceptual example illustrating limits of mineral classification.

Properties: In descriptive accounts, sivureitit is said to have a Mohs hardness of about 5.5–6, a measured density around 4.2 g/cm3, and a conchoidal fracture. Its luster is metallic to adamantine, and it reportedly exhibits a blue-green iridescence due to thin‑film interference. The reported chemical composition varies across sources, commonly cited as a complex silicate with trace metallic elements, but no consensus exists.

Occurrence and status: There are no verified mineral specimens published in peer‑reviewed literature. The term appears mostly in speculative contexts, collector anecdotes, and fictional settings, and is not recognized by major mineral databases.

Etymology and usage: The name sivureitit has appeared in some regional languages in fiction and in hypothetical taxonomy discussions. In academic contexts, sivureitit is used as an example to discuss criteria for mineral species, nomenclature, and the role of empirical verification.