silicate hydroxide. It occurs in two more or less distinct varieties, namely, crystalline folia and which compact masses. In the ideal case, the structural formula is expressed by Al2Si4O10(OH)2 for pyrophyllite. Therefore, the 2:1 layers of these minerals are electro statically neutral and are held together with Van der Waals bonding. One-layer triclinic forms are known for as polytypes of pyrophyllite.
The frequency at 737 cm1 is due to OAH out of plane bending mode vibration, which is identified by Pyrophyllite minerals. The compact variety of pyrophyllite is used for slate pencils and French chalk. It is added to clay to reduce thermal
expansion when firing but it has many other industry uses when combined with other compounds, such as in insecticide and for making bricks. Pyrophyllite is also widely used in high-pressure experiments, both as a gasket material and as a pressure-transmitting medium. The inhalation of Pyrophyllite may cause Silicosis disease. The disease consists of inflammation of the respiratory system tissues that eventually causes fibrosis, the hardening of the lungs, reducing the ability to breathe efficiently.