Mg2Si2O5OH4

Mg2Si2O5OH4 is the chemical formula for clinoenstatite, a mineral belonging to the pyroxene group. It is a magnesium silicate hydroxide. Clinoenstatite is a polymorph of enstatite and is characterized by its monoclinic crystal structure. It is often found in metamorphic rocks, particularly those that have undergone high-pressure, low-temperature metamorphism. The 'OH4' in the formula indicates the presence of hydroxyl groups within the crystal lattice, distinguishing it from anhydrous pyroxenes. Its formation is typically associated with serpentinization processes, where olivine or pyroxene minerals are altered by hydrothermal fluids. Clinoenstatite can also occur in some extraterrestrial materials, such as meteorites. It is generally a pale green to colorless mineral, though impurities can impart other colors. Its hardness is around 5.5 on the Mohs scale.