Talc, wet magnesium silicate and the theoretical formula 3 MgO 4SİO2 H2O'. The composition of the ideal SİO 63.5%2 31.7% MgO and 4.8% includes the H2O. Remove the transparent white, greenish color, slippery, solid looking and soft. Depending on the hardness of the Mohs chart varies between 1-1.5. Density 2.6-2.8 g/cm3. The shape of the crystal monokliriktir. Talc heat and electrical conductivity is weak but it is fire-resistant. When heated at high temperatures is tight, solidify. It doesn’t spoil by Acids.