finiras

Finiras is a fictional mineral described in speculative geology and worldbuilding contexts. In most renderings, finiras forms a layered silicate lattice that combines conventional mineral properties with unusual electronic behavior, enabling it to store and release electrical charge while remaining transparent in the visible spectrum.

The name is typically traced to Finira, a folkloric figure in the world where finiras is discussed, with some writers noting alternate spellings such as Finirae. No recognized natural sample exists outside fiction, and real-world science does not acknowledge finiras as an established mineral.

Physical properties commonly attributed to finiras include a color range from colorless to pale blue, an iridescent sheen in some specimens, Mohs hardness in the 6–7 range, and a density around 3.2–3.6 g/cm3. It is described as having a refractive index near 1.60–1.65 and exhibiting photoluminescence under ultraviolet light. Thermally, finiras is depicted as stable to about 900°C in air, though exact figures vary by story.

Formation and occurrence are described in fiction as taking place under high-pressure metamorphism in ultramafic to basaltic rocks and within hydrothermal veins. It is often found as prismatic crystals up to a few centimeters and is commonly associated with minerals such as olivine, pyroxene, and plagioclase.

Applications and significance in imagined settings include energy storage, high-strength coatings, and microelectronic components. Its dual optical-electronic properties make it a popular device in plots involving sensors or resonators. Because finiras is fictional, details vary by author, but most treatments emphasize its unusual lattice and multifunctional potential.