The matt white lustrous mineral talc (magnesium silicate hydroxide) with the chemical composition [Mg3(OH)2(Si2O5)2] is one of the phyllosilicates and has a Mohs hardness of 1.
Talc has many varied applications and is used, for example, as a finely-ground filler in the paper and pulp industry, the paint and dye industry as well as the rubber, plastics and ceramics industries. The mineral is even used in the pharmaceutical industry, for example as a base for powder or as a mold-release agent in the manufacture of tablets. Its high temperature resistance makes talc an important component of fireproof materials such as ceramics. Additional applications for talc can be found in such fields as electrical engineering as an insulation material or in food technology as a releasing agent and as a carrier substance for dyes.