Talc Stones
Talc Stones
Talc is a mineral composed of hydrated magnesium silicate, with the chemical formula H2Mg3(SiO3)4 or Mg3Si4O10(OH)2. It is widely used in its powdered form. It is found in fibrous masses, and the occurrence of the monoclinic crystalline form of talc is rare.
Talc deposits are divided into four main types:
- Massive talc: Its crystals are irregular, and this type is suitable for the electrical tool industry.
- Foliated talc: This type is formed by the alteration of dolomitic limestone rocks and is considered one of the important types. It is used in most industries.
- Tremolite talc, sometimes called “hard talc”: It contains a percentage of tremolite and is characterized by its high magnesium content, reaching up to 10%.
- Mixed talc ores: These ores contain varying proportions of chlorite, dolomite, and serpentine. Good quality talc is distinguished by its magnesium content, whiteness, and the smoothness of the grinding process.
It is possible to increase the magnesium content through various concentration methods, depending on the type of rock and its impurities, which can be removed to modify the quality of the talc. This is done in medical and technical industries.
Applications and Uses of Talc
Talc is used in various industries such as paper manufacturing, plastics, paints, coatings, rubber, food products, electrical cables, pharmaceuticals, cosmetics, ceramics, etc. Coarse gray-green talc, known as high-grade talc, is smooth and soapy. It is used for stoves, sinks, electric switchboards, and other purposes. It is often used as a protective material for laboratory countertops and electrical switches due to its resistance to heat, electricity, and acids.
