Magustoite

Magustoite is a fictional mineral species that recurs in speculative geology and science fiction. It is not a recognized mineral by the International Mineralogical Association, and there are no verified natural specimens in public collections. In most fictional contexts, magustoite is described as a rare, vividly colored mineral that can exhibit a color change under different lighting, typically appearing violet, blue, or green. It has a vitreous to resinous luster and a transparent to translucent appearance, with a hardness commonly reported in the mid-range on the Mohs scale (about 4 to 6) and a specific gravity around 3.5 to 4.0. Because magustoite is fictional, its precise chemical composition and crystal structure vary between sources, though it is sometimes described as a complex oxide or phosphate, and occasionally as a silicate rich in transition metals.

In narrative settings, magustoite is said to form in hydrothermal veins and high-temperature metamorphic zones, often associated with magnetite, apatite, or amphibole. Its crystals are depicted as prismatic or tabular, occasionally forming twinned or cabinet-sized aggregates in fictional geologic environments. The mineral is often attributed with energetic or metaphysical properties, and as a plot device it can symbolize rarity, power, or mystery.

References to magustoite appear in fictional geological dictionaries and world-building guides, where it serves as a convenient shorthand for an exotic, valuable mineral. See also fictional minerals; mineralogy in fiction.