Kausta

Kausta is a fictional mineral used in world-building and speculative fiction to illustrate themes of energy storage, mineral genesis, and cultural symbolism. In the lore of the archipelago of Thysara, kausta appears as iridescent, plate-like crystals that emit a soft glow in darkness. It is described as having high energy density, stability across a wide temperature range, and a slow, self-limiting release of energy when stimulated by light or heat.

Etymology: The name kausta comes from a constructed language used by the northern coastal peoples in various stories; it is said to mean light binder.

Description: In-universe chemistry is depicted as a silicate-oxide matrix with trace rare-earth elements. Crystals form as tabular prisms with layered growth patterns. Reported Mohs hardness ranges from 6 to 7; density is around 3.2 g/cm3. Kausta crystals display photochromism and can store energy that is released as optical pulses or heat when needed.

Geology and occurrence: Kausta is said to form in geothermally active regions where basaltic magma interacts with metasomatic fluids. In the setting, it occurs in veins near volcanic rims and hydrothermal vents and is often found alongside other energetic minerals. Extraction is hazardous due to volatile gas release and subsidence risk.

Uses and cultural significance: In technology within the fiction, kausta powers compact energy cells and photonic devices, and its luminescence informs navigation and signaling. Culturally, it features in rites that honor dawn and is credited with guiding lost travelers. Ancient myths describe kausta as a conduit between the living world and the planet’s breath.

In fiction: Kausta has appeared in several novellas and world-building anthologies within the Kausta cycle, where scholars discuss its properties, ethics of mining, and implications for energy politics.