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Magnesium silicate mineral containing crystal water Mg(SiO10)(OH)2 or 3Mg.4SiO2.H2O. It is found in spherical, lamellar and fibrous formed crystal structures. Refractive index: 1,54-1,59; specific gravity: 2,70-2,85; oil absorption value: 23-52 g/100 g talc. It enhances sanding of paint, primer and putties. Due to its high oil absorption value, it increases the viscosity of paint and provides active matting.