MgFe2Al2O4

MgFe2Al2O4 is a chemical compound classified as a spinel group mineral with a complex oxide composition. It consists of magnesium (Mg), iron (Fe), aluminum (Al), and oxygen (O). The mineral form adheres to the general formula AB₂O₄ typical of spinel structures, where magnesium and iron occupy the A and B sites within the crystal lattice, and aluminum substitutes into the B site, resulting in the formula MgFe₂Al₂O₄.

This mineral exhibits a cubic crystal system, often forming octahedral or dodecahedral crystals, with a vitreous to metallic luster. Its color can vary from reddish-brown to dark gray, depending on its specific composition and oxidation state of the iron ions. MgFe₂Al₂O₄ is typically found in ultramafic and metamorphic rocks, often associated with other spinel minerals.

The formation of MgFe₂Al₂O₄ involves high-temperature and high-pressure geological processes, often occurring in the Earth's mantle or during the metamorphism of aluminum-rich rocks. It is of interest in mineralogy and petrology because it provides insights into mantle composition and processes.

While not commercially exploited, MgFe₂Al₂O₄ and related spinels are significant in understanding geological processes and can be used as geothermometers or geobarometers. Additionally, spinel minerals are valued as gemstones in their transparent forms, although MgFe₂Al₂O₄ is generally not used for jewelry due to its typical earthy appearance.