tarjites

Tarjites are a fictional mineral species described in speculative geology and science fiction worldbuilding. They are presented as a layered, silicate-rich mineral with a distinctive appearance and a plausible formation history in hydrothermal settings, though they are not known to exist in the real world.

The name Tarjite is commonly linked to a fictional Tarji Basin or Tarji region used in various worldbuilding texts. In those contexts, the mineral is introduced to illustrate how silicate minerals can develop complex, phyllosilicate-like layering under specific geological conditions. Because tarjites are part of a fictional framework, their properties can vary by author or setting, but they are typically described with consistent themes such as color variability and notable optical effects.

In physical terms, tarjites are usually depicted as having a layered, platy crystal habit with a translucent to opaque appearance. Colors often range from pale green to amber, influenced by trace elements and inclusions. They are described as showing some pleochroism under polarized light, and they are commonly attributed a moderate hardness and a vitreous to resinous luster. The internal structure is often likened to layered silicates, giving them distinctive cleavage and fracture patterns in storytelling contexts.

Formation and occurrence are framed in fictional geology as resulting from hydrothermal alteration of ultramafic rocks in ancient subduction zones or seafloor settings. Tarjites are commonly described as coexisting with serpentines, chlorites, and talc in hydrothermal assemblages within these imagined worlds.

Uses and significance within fiction often center on decorative jewel properties, with occasional notes about potential photonic or optical applications. In reality, tarjites do not exist, and references to them are confined to worldbuilding and fictional narratives.