Hkujuline

Hkujuline is a fictional aluminosilicate mineral described in geoscience educational material and speculative minerals literature. It is presented as a framework silicate (tectosilicate) with a dominant composition of sodium, aluminum, silicon, and oxygen, and trace amounts of iron and magnesium. The proposed chemical formula is NaAlSi3O8 with partial substitution by Fe and Mg and hydroxyl groups.

Crystal system and properties: Hkujuline crystallizes in the monoclinic system, typically forming prismatic to tabular crystals. Color is pale emerald-green; streak white; luster vitreous; hardness about 6 on the Mohs scale; density around 3.0 g/cm3. Cleavage is present in two directions; fracture conchoidal in imperfect specimens. It is biaxial with weak pleochroism.

Occurrence: In the fictional setting, Hkujuline forms through hydrothermal alteration of felsic rocks at moderate temperatures in the Hkuj Massif region. It is commonly found in quartz–calcite–chlorite veins. The mineral’s discovery is attributed to a 2003 field study by geologist A. M. Kuje.

Etymology and status: Named for the Hkuj Mountains; the name follows common mineral nomenclature. As a fictional entry, it does not have an IMA designation. See also: related minerals such as albite and analcime.

Uses and significance: Hkujuline is of educational and speculative interest, illustrating tectosilicate structure and paragenesis. It has no commercial ore value in the fictional setting, but serves as a teaching example for mineral classification and crystal-chemistry analysis.