Talc Talc Talc or talcum is a clay mineral composed of hydrated magnesium silicate with the chemical formula HMg(SiO) or MgSiO(OH). In loose form, it is (in ratio with or without corn starch) one of the most widely used substances known as baby powder. It occurs as foliated to fibrous masses, and in an exceptionally rare crystal form. It has a perfect basal cleavage, and the folia are not elastic, although slightly flexible. The Mohs scale of mineral hardness, based on scratch hardness comparison, defines value 1 as the hardness of talc. Talc can easily be scratched by a fingernail. Talc
Frederic E. Mohs sections are examined instead of the Mohs paste-fixed sections. This method is now commonly referred to as Mohs surgery, and occasionally "chemosurgery", in reference to the Mohs paste that Mohs initially used. In 1943 Mohs married Mary Ellen Reynolds, who died in 1995. Mohs died at his home in Madison, Wisconsin on 2 July 2002, at the age of 92. He was survived by two sons, Frederic and Thomas, of Madison; and a daughter, Jane Schimming of Stuart, Fla. Frederic E. Mohs Frederic Edward Mohs (1 March 1910 – 2 July 2002), a physician and general surgeon, developed the Mohs