It is a mineral composed of aqueous magnesium silicate in chemical form: H2Mg3 (SiO3) 4 or .Mg3Si4O10 (OH) 2 Talc is the softest mineral according to the Mohs scale for hardness of minerals, and can be easily scratched with nails. Widely used as that powder.It is transparent to opaque. Its color ranges from white to gray or green and has a distinct waxy texture. Talc uses 1- It is used in medicinal preparations. 2- It is used as an insulator in electrical insulators. 3- It is used in welding wires. 4- Plastic and leather tanning industry. 5- Ceramic and Chinese industry. 6- Making pencils and rice bleaching. 7- Rubber and paper-making.