üheliitri

Üheliitri is a fictional hydrous lithium-aluminum silicate mineral described in speculative mineralogy and used in worldbuilding exercises. The name is invented for imaginary geologic settings and does not correspond to any mineral catalogued in real-world databases.

Its proposed chemical formula is LiAl3Si4O12(OH)2, and it is said to belong to a silicate family characterized by layered sheets of tetrahedra and octahedra connected by hydrogen bonds. Crystals are described as monoclinic, commonly forming tabular prismatic crystals up to a few centimeters in size. Typical physical properties are hardness 4–5 on the Mohs scale, specific gravity around 2.9, and a vitreous to pearly luster. The color ranges pale green to pale blue, and the streak is white.

In fiction, üheliitri is said to form during low-temperature hydrothermal alteration of aluminous igneous rocks within pegmatite dykes. It is commonly associated with spodumene, lepidolite, muscovite, albite, and quartz. Reported localities are limited to imaginary regions such as the Shurian Belt or Ühelia Highlands.

Because it is fictional, üheliitri has no verified industrial use or safety profile. It is sometimes used in teaching about silicate structures, mineral classification, and the generation of mineral species in hypothetical crustal processes.

See also: Lithium minerals, Silicates, Pegmatites, Mineralogy, Worldbuilding resources.