A process of obtaining synthetic magnesium silicate by a precipitation method with the use of silicic acid sols and selected magnesium salts was analysed in order to establish the optimum parameters of the process ensuring getting a product of desired properties. The influence of the following parameters was taken into regard: concentration and type of magnesium salt, concentration of silicic acid sol and direction of reagents supply. The synthetic magnesium silicate was subjected to physico-chemical analysis. The chemical compositions of the products and their crystalline structures were determined. Moreover, the morphology, dispersion and adsorption properties of the products were characterised. The magnesium silicate obtained according to the procedure proposed is highly dispersed, homogeneous and of well-developed surface area.