allatrio

Allatrio is a fictional mineral used in science fiction, worldbuilding, and educational contexts to illustrate mineralogical classification and exploration scenarios. In the imagined geology of the setting, allatrio is a rare complex aluminosilicate containing aluminum and titanium, with trace amounts of iron and chromium that yield variable color.

Occurrence and formation: Allatrio is described as forming in high-temperature hydrothermal veins within basaltic or ultramafic rocks. In published worldbuilding guides, it is found in the fictional archipelago of Eryndor and in metamorphosed crustal sections worldwide. It is typically associated with quartz, spodumene, and magnetite.

Properties: Allatrio crystallizes in the monoclinic system and forms prismatic crystals, though it is more often seen as tabular grains. It has a vitreous luster, and colors range from emerald-green to pale violet depending on trace element content. Mohs hardness is mid-range, about 6 to 7. It has a relative density around 3.1 to 3.4 g/cm3 and a refractive index near 1.63 to 1.70.

Uses and cultural context: In fiction, allatrio is sometimes described as a potential source of lightweight industrial materials or decorative gemstones for specialized collections. Educationally, it serves as a case study for mineral classification, crystallography, and geochemical zoning. Real-world mining and commerce do not involve allatrio.

See also: Aluminosilicate minerals, Titanium minerals, Monoclinic minerals, Metamorphic minerals.