fertinite
Fertinite is a hypothetical mineral that has been proposed as a component of certain exoplanet atmospheres, specifically those with high concentrations of nitrogen and carbon. Its existence and composition are purely theoretical at this stage, based on models of atmospheric chemistry under extreme conditions. Scientists have speculated that under the intense pressures and temperatures found in some exoplanets, nitrogen and carbon could combine to form complex organic molecules that might be stable in those environments. Fertinite is one such proposed molecule.
The specific structure and properties of fertinite are not well-defined, as it has not been observed or