withei

Withei is a term used in speculative fiction to denote a fictional mineral. It is not a real mineral recognized by modern geology, and the name appears in several works of science fiction and role-playing settings as a valuable, technologically important resource.

In the fictional lore, withei forms in high-energy metamorphic environments or deep hydrothermal pockets within ultramafic rocks, often near subduction zones. It is described as occurring as clear or pale white prisms and occasionally as rounded nodules. The mineral is typically portrayed as rare and difficult to mine.

Physical and mechanical characteristics in these narratives often include a glassy to pearly luster, a hardness around 6 on the Mohs scale, and a relatively light density. A key property is its semi-conductive behavior and exceptional stability at high temperatures, which makes it attractive for energy storage, advanced electronics, and propulsion-related technologies in the stories.

Industrial and cultural roles vary by work; in many settings withei commands high economic value and is subject to monopolies or smuggling. It is sometimes depicted as a core component of power cells, superconducting devices, or lightweight armor in spacefaring civilizations.

Etymology and usage notes: the name withei is typically given a pale, luminous connotation and may be linked to “white” imagery in world-building texts. There is no real-world equivalent, and readers should treat it as a fictional device within its respective universe.

See also: fictional minerals; world-building materials; withei in popular culture.