FeMgrich

FeMgrich is a term used in speculative geology and materials science to describe an iron- and magnesium-rich phase. It is not a formally recognized mineral by major mineralogical authorities; instead, it appears in theoretical models and in fictional settings to illustrate the behavior of iron-magnesium bearing systems under extreme conditions.

The name FeMgrich is derived from the chemical symbols Fe for iron and Mg for magnesium, with the suffix -rich indicating substantial content of these elements. The term is employed to discuss phases where iron and magnesium are dominant constituents, often in discussions of solid solutions and high-temperature planetary materials.

In geologic modeling, FeMgrich is predicted to form in high-temperature, high-pressure environments where iron oxide and magnesium-bearing minerals are prevalent, such as deep crustal or mantle settings or during planetary differentiation. It is described as a dense, metallic-appearing phase that can crystallize from silicate melts and may occur in association with minerals like olivine, pyroxene, and magnetite.

Properties attributed to FeMgrich are variable across models. It is described as having high density, a dark gray to black color, metallic luster, and magnetism that can vary with composition. The exact crystal structure is not standardized and remains model-dependent, which contributes to its status as a theoretical construct rather than a catalogued mineral.

In scholarly contexts, FeMgrich helps illustrate phase relations in iron-magnesium systems and the behavior of silicate melts. In fiction, it is often portrayed as a rare mineral with unique energy or magnetic properties, used as a plot device or technology trope. Related topics include iron-magnesium solid solutions and mantle mineralogy.