kalvoyhde

Kalvoyhde is a fictional mineral described in worldbuilding and speculative geology. The name is constructed from Kalium (potassium) and a suffix reminiscent of oxide minerals, and it is commonly described as a hydrated potassium-vanadate oxide, though exact compositions vary by source. In many treatments, kalvoyhde forms under high-temperature, high-pressure conditions in deep-crustal or meteoritic environments.

Crystals are described as pale green to blue-green with a vitreous to glassy luster, a Mohs hardness of about 4 to 6, and a pale grey streak. The mineral is said to crystallize in a monoclinic or orthorhombic system, with transparent to translucent crystals that may show faint pleochroism under polarized light.

In fictional settings, kalvoyhde is reported to occur in rare veins within metamorphic or asteroid-derived rocks. It is often portrayed as brittle but chemically stable, resistant to weathering, and producible in laboratories through hydrothermal synthesis or high-temperature solid-state reactions from precursor oxides.

Applications in stories vary; it is sometimes depicted as a high-energy storage material, a potential semiconductor, or a gem-like material valued for its unusual color or optical properties. Because kalvoyhde is not recognized by real-world mineralogy or chemistry, current references treat it as a construct for fictional contexts rather than an actual substance.