KivimiteMg

KivimiteMg is a proposed magnesium-rich silicate mineral described as an end-member within the pyroxene group. The name points to magnesium as the principal cation, with iron capable of substituting in smaller amounts. In theoretical terms, its simplified formula is written as (Mg,Fe)SiO3, representing a solid solution between more magnesium-dominant and iron-bearing compositions.

Crystal structure and classification: KivimiteMg is described as an inosilicate with a single-chain silicate framework, crystallizing in the orthorhombic system. It would be related to the enstatite–diopside portion of the pyroxene family and share the characteristic pyroxene features, including two good cleavages and acute-angle intersections near 90 degrees.

Physical properties: In synthetic samples, kivimiteMg is expected to appear as pale to olive-brown or gray-green prisms. The mineral is projected to have a Mohs hardness around 5–6 and a specific gravity near 3.2–3.4. Optical properties would align with typical pyroxenes, with modest refractive indices and anisotropic behavior.

Occurrence and formation: No natural specimens have been confirmed to date. In experimental simulations of high-temperature metamorphic conditions, kivimiteMg can form in magnesium-rich silicate systems in the presence of appropriate fluids and melts. If it occurs in nature, it would likely be found in ultramafic to basaltic rocks formed under high-temperature metamorphism or magmatic differentiation, with associations such as olivine, enstatite, and diopside.

Etymology: The name combines kivim, a coined term linked to stone, with Mg to indicate magnesium content. The designation kivimiteMg is used here for theoretical discussions and has not been established as a recognized natural mineral species in major databases.

See also: Pyroxene group; Forsterite; Enstatite; Magnesium minerals.