Most people use products made from talc every day; however, they don't realize that talc is in the product or the special role that it plays Talc is a hydrous magnesium silicate mineral with a chemical composition of Mg3Si4O10 (OH) 2.it is usually green, white, gray, brown, or colorless. It is a translucent mineral with a pearly luster. It is the softest known mineral and is assigned a hardness of 1 on the Mohs Hardness scale. Talc occurred in talc-rich schists or steatite through hydrothermal alteration of mafic rocks (steatitization) subsequent to serpentinization during green schist facies metamorphism. Also formed by thermal low-temperature metamorphism of siliceous dolostones.
TALC ROCK IN EGYPT
Many of talc deposits in the Eastern Desert of Egypt such as Atshan, Abu Gurdi, Darhib, w. kharouf , w. alaky and Kashira
1- In the manufacturing of plastics.
2- In the manufacturing of ceramics products such as bathroom fixtures, ceramic tile, pottery, and dinnerware.
3- As an extender and filler in paints.
4- As a mineral filler to improve the opacity, brightness, and whiteness of the paper.
5- As the powder base of many cosmetic products.
6- Roofing materials to improve their weather resistance.
7- In a wide variety of dimension stone and sculpture applications.
8- As a lubricant in applications where high temperatures are involved.
9- As a carrier for insecticides and fungicides.
10- Reduces wear on application equipment.
11- In rubber industry.
- Mohs Hardness: 1
- Specific Gravity 2.7 to 2.8
- Brightness : 83 – 92 %
- Diaphaneity: Translucent
- Cleavage: Perfect on .
- Tenacity: Sectile; Flexible but not elastic
-Translucent. Color: Light to dark green, brown, white; colorless in thin section.
- Streak: White.
- Luster: Pearly, greasy, and dull.
- Optical Class: Biaxial (-).
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