obsidio

Obsidio is a fictional mineral described in speculative geology and science fiction. It is presented as a dense, glassy material formed by rapid quenching of silica-rich magmas, with a conchoidal fracture and a vitreous luster. In most depictions, obsidio contains iron- and titanium-bearing inclusions that impart a dark color, often black or deep emerald, and can exhibit iridescence under light.

Chemical and physical properties are described variably across sources, but typical traits include a silicon dioxide-dominant composition, refractive index higher than common window glass, Mohs hardness around 5–6, and a density in the range of 2.2–2.6 g/cm3. Microstructure is described as an amorphous glass matrix with occasional micro-vesicles and rare mineral inclusions.

Formation and occurrence: In fictional or hypothetical settings, obsidio forms when lava erupts rapidly, with cooling rates sufficient to prevent crystallization; it may also be created synthetically in laboratory glass-making or high-velocity quench experiments.

Uses and significance: In stories, obsidio is valued for its beauty, conductivity, or energy-storage properties, and is sometimes attributed ceremonial or symbolic significance. Real-world analogues often cited include obsidian and other volcanic glasses.

History and terminology: The name obsidio is derived from the visual similarity to obsidian and is used by some writers and speculative scientists; it lacks formal recognition in established mineralogy databases.

See also: obsidian, volcanic glass, tektite, fulgurite.