Loendurite

Loendurite is a fictional mineral that appears in science fiction literature and tabletop gaming sources. It is not a real mineral recognized by contemporary geology or mineralogy. The name is typically tied to the invented region of Loendur in the narrative worlds where the substance is described.

In these works, loendurite is characterized by high density and metallic or submetallic luster. Descriptions vary, but common values cited include a Mohs hardness around 6 to 8, substantial thermal stability, and a high refractive index. The mineral is often depicted as containing transition-metal-rich inclusions and as forming through extreme metamorphic or subduction-zone processes, or being synthesized in advanced laboratories for critical technologies.

Chemical composition and crystal structure likewise vary across sources; loendurite is often described as a complex silicate-oxide with trace platinum-group metals, or as a non-stoichiometric oxide with variable composition. Because it is fictional, no standard reference composition exists.

In fiction, loendurite is frequently used as a power source, catalyst, or armor material due to its supposed energy density, radiation resistance, or magnetic properties. Some depictions grant it superconducting capabilities at higher temperatures.

See also: fictional minerals, minerals in speculative fiction.