FeMg3Si4O12OH2

FeMg3Si4O12OH2 is the chemical formula for a mineral belonging to the amphibole group. Specifically, it represents a member of the talc-tremolite series. This mineral is characterized by its silicate structure, containing iron (Fe), magnesium (Mg), silicon (Si), oxygen (O), and hydroxyl (OH) groups. The presence of both iron and magnesium in significant amounts influences its physical and chemical properties.

Minerals with this composition often exhibit colors ranging from white to green or gray, depending on the oxidation state of the iron. They typically form in metamorphic rocks, particularly those that have undergone low to medium-grade metamorphism. The crystal structure is an amphibole structure, which is a double chain silicate. This structure contributes to its characteristic prismatic cleavage.

In geological contexts, FeMg3Si4O12OH2 can be found associated with other common metamorphic minerals like quartz, calcite, and chlorite. Its occurrence is linked to the alteration of mafic and ultramafic rocks. While not a widely recognized gemstone, its presence in rock formations provides valuable information about the metamorphic conditions under which they formed. Further characterization often involves techniques such as X-ray diffraction and electron microprobe analysis to confirm its precise composition and structural details.