MgAl2Si4O10OH2

MgAl2Si4O10OH2 is the chemical formula for a mineral belonging to the mica group. Specifically, it represents a member of the trioctahedral mica subgroup. This mineral is commonly known by the name clintonite. Clintonite is a hydrous magnesium aluminum silicate. It is characterized by its platy or micaceous habit, meaning it can be cleaved into thin, flexible sheets. The structure of clintonite, like other micas, consists of layers of silicate tetrahedra and octahedral sheets. In clintonite, the octahedral sheet contains magnesium and aluminum cations, while the tetrahedral sheets contain silicon and aluminum. The presence of hydroxyl groups (OH2) is also a defining feature of its structure and classifies it as a hydrous mineral. Clintonite typically forms in metamorphosed carbonate rocks, often in association with minerals like calcite, dolomite, and spinel. It can also occur in certain igneous rocks. The color of clintonite can vary, commonly appearing as yellowish, reddish, or brownish hues, often with a pearly luster. Its refractive index and specific gravity are typical for mica group minerals. While not as common as some other micas, clintonite is of interest to mineralogists for its specific chemical composition and structural characteristics within the mica family.