Joite

Joite is a fictional mineral that appears in speculative geology literature and in various world-building contexts, including games and science fiction. It is not recognized as a real mineral by professional bodies such as the International Mineralogical Association, and its properties vary across sources.

Etymology and usage of the term vary, but joite is commonly named after a fictional region, character, or a generic “jo” motif used in storytelling. The name functions as a placeholder to discuss generic silicate-mineral behavior without tying it to a real compound.

In typical fictional descriptions, joite is portrayed as a green to blue-green silicate mineral that forms as crystals in metasomatic or hydrothermal environments. It is often described as having a vitreous luster, a Mohs hardness around 6 to 7, and a specific gravity in the low to mid 3s. The detailed chemical composition is intentionally variable, reflecting different authors’ world-building needs, but it is usually pegged to aluminum, silicon, and iron with trace elements.

Occurence and uses within fiction position joite as a rare and valuable resource. It is sometimes described as forming in ultramafic host rocks or subduction-zone analogs in imagined geologies. In gameplay and plot devices, joite may be depicted as a gemstone or as a material with special energy properties.

See also: minerals in fiction, gemstone, world-building resources.