Al2Si2O5(OH)4

Al₂Si₂O₅(OH)₄ is the chemical formula for a mineral called kaolinite, a type of clay mineral. It consists of layers of aluminum, silicon, oxygen, and hydroxide (OH) groups. These layers are stacked and held together loosely, giving kaolinite its softness and plasticity. It is commonly found in soils, ceramics, and as a raw material in many products. Its structure makes it stable and resistant to chemical change, making it useful in industries like paper production, pottery, and cosmetics.