Objo

Objo is a fictional mineral created for worldbuilding and teaching materials to illustrate how minerals are described and classified in geology. It is not a real mineral recognized by standard scientific authorities, but it serves as a neutral example of mineral properties, crystallography, and terminology.

In the imagined canon, objo is a layered silicate with a proposed chemical composition such as (Ca,Na)(Al,Fe)Si2O6 and trace rare-earth elements. It is described as crystallizing in the monoclinic system, often forming prismatic crystals that display a blue-green to iridescent color and a vitreous to silky luster. Its structure is presented as having alternating sheets that contribute to distinctive cleavage and stability under pressure.

Formation and occurrence are depicted as occurring under high-temperature metamorphic conditions in basaltic crusts. In the fictional setting, objo is found in association with minerals like quartz, magnetite, and apatite, and is said to occur on planets or asteroidal bodies with basaltic geology. The narrative typically uses objo to illustrate how mineral paragenesis and depositional environments influence mineral assemblages.

Physical properties and potential applications within the fiction often include a Mohs hardness around 6.5 and a density near 3.2 g/cm3. Some treatments in the story describe objo as having mild piezoelectric response and photonic properties that could, hypothetically, support energy storage or optical device concepts. The name objo is usually explained as a constructed term from the story’s language, chosen to evoke objects and illumination.

See also: fictitious minerals, worldbuilding resources.