Talc is a magnesium-containing mineral made of silicate. This mineral always has impurities with it, which of course is a pure mineral in nature, but it is very rare. Impurities associated with talc are usually manganese oxide, quartz, carbon and iron, and due to their acidic properties, although poorly soluble in acid. Talc is fatty, slippery and soft due to its high density and weak molecular bond, and if the density of talc increases, it is used as a soapstone. Talc is known by the chemical formula Mg3Si4O10 (OH) 2. In this formula, if too much iron is substituted for magnesium, the substance is converted to minsuite, and if aluminum is substituted for magnesium in this formula, pyrophyllite will be made. The highest amount of talc in the world is found in schist and serpentine rocks. Mafic rocks, ultra mafic and dolomites are also important sources of talc. Regions such as the United States, Western Europe, and parts of Asia have large reservoirs of talc. Our country Iran also has very rich talc reservoirs in the cities of Yazd, Hamedan, Khorasan, Hormozgan, Zanjan and Sistan and Baluchestan.