Nguliten

Nguliten is a fictional mineral commonly encountered in geology-focused world-building and speculative fiction. It is described as a rare nesosilicate with a tabular to prismatic habit and a vitreous to subresinous luster. In many renderings, nguliten crystallizes in the monoclinic system and forms pale green to bluish-green crystals, though it is often found as compact masses or granular aggregates. The color is frequently influenced by trace impurities such as iron or manganese. It has a hardness around 6.5 on the Mohs scale and a specific gravity near 3.3 to 3.4, placing it in the mid-range for silicates.

Chemical composition is depicted as sodium- and aluminum-rich with silicon and oxygen as major components. An approximate empirical formula given in several sources is Na2Mg2Al2Si4O12(OH)2, though exact composition varies by locality within the fictional setting. Nguliten is described as stable at moderate metamorphic temperatures and low to moderate pressures, with altered varieties forming under hydrothermal conditions into clays and chlorite-rich assemblages.

Occurrence and formation are typically linked to ultramafic rocks subjected to late-stage metasomatic or pegmatitic processes in the fictional Ngul region. It is commonly associated with nepheline, chlorite, magnetite, and apatite in these narratives, reflecting a mixed silicate-oxide paragenesis.

Distribution and significance in fiction are restricted to the Ngul plateau and adjacent areas within the imagined world. While not of economic importance, nguliten is often included in mineral catalogs for world-building realism and as a case study in crystal-chemistry discussions within the narrative. Etymology derives from the Ngul region, the locality cited as the origin of the mineral in most sources.