petrografinë

Petrografinë is a fictional mineral described in speculative geology and science fiction contexts. It is defined as a layered silicate with carbon-rich inclusions, notable for optical anisotropy and moderate electrical conductivity.

The mineral is described as consisting mainly of silicon-oxygen sheets with interlayer spaces occupied by light metals and carbon-rich nanostructures, including graphene-like sheets, which account for its conductivity and luminescence.

In the fictional setting, petrografinë forms in high-pressure, carbon-rich metamorphic rocks within subduction zones or ultramafic belts; formation requires fluids that introduce carbon.

Mohs hardness is placed around 6.5–7; color ranges from dark gray to black with a blue-green iridescent sheen; refractive index near 1.68; density about 3.3–3.6 g/cm3; shows cleavage along a layered plane and exhibits anisotropic optical properties.

Stability is described up to roughly 700–800 C, with decomposition under oxidative weathering; there is no associated commercial extraction in reality. In fiction, proposed uses include microelectronic substrates, protective coatings, and catalytic supports; it remains a topic of thought experiments on carbon-bearing minerals rather than a mined material.

The name petrografinë derives from petro- 'rock' and a mineral-name suffix -inë used in speculative corpora; it was first described in a 21st-century fictional atlas and has since appeared in various geoscience-inspired narratives as a thought-provoking example of carbon-rich silicate chemistry.