Na2Ca2Mg2Fe22Si8O22OH2

Na2Ca2Mg2Fe22Si8O22OH2 is the chemical formula for a complex silicate mineral belonging to the amphibole group. Amphiboles are characterized by their double-chain silicate structure. This particular formula represents a highly iron-rich variety, often referred to by more common mineral names, though specific nomenclature can be complex and depend on detailed compositional analysis and crystal structure determination. The presence of sodium (Na), calcium (Ca), magnesium (Mg), and iron (Fe) indicates significant substitution possibilities within the amphibole structure. The high iron content suggests it likely forms under specific geological conditions. Minerals with similar compositions can be found in various igneous and metamorphic rocks, particularly those that are mafic or ultramafic in origin, or have undergone hydrothermal alteration. The hydroxyl (OH) group is a fundamental component of amphibole structures, influencing their physical and chemical properties. Detailed analysis, such as electron microprobe analysis and X-ray diffraction, is required to precisely identify and classify minerals with this formula, as slight variations in cation ratios can lead to different mineral species within the extensive amphibole family.