Talc is a clay mineral composed of hydrated magnesium silicate with the chemical formula H2Mg3 (SiO3)4 or Mg3Si4O10(OH)2. In loose form, it is (in ratio with or without corn starch), one of the most widely used substances known as baby powder.
This mineral is used as a thickening agent and lubricant; is an ingredient in ceramics, paint, and roofing material; and is a main ingredient in many cosmetics.
Talc is used in many industries, including paper making, plastic, paint and coatings (e.g. for metal casting molds), rubber, food, electric cable, pharmaceuticals, cosmetics, and ceramics. A coarse grayish-green high-talc rock is soapstone or steatite, used for stoves, sinks, electrical switchboards, etc. It is often used for surfaces of laboratory table tops and electrical switchboards because of its resistance to heat, electricity and acids.