A method how to obtain a material from dolomite and clay mixture has been developed for restoration needs. The material would be similar to Roman cement, produced from natural marls, it was widely used in 19/20th century’s architecture. In this work four different mixtures made from Quartemary period clay from deposit Spartaks and Devonian period clay from deposit Kuprava mixed with dolomite from deposit Kranciems are discussed. For research purposes two temperatures were chosen – 800 and 900°C. Compositions with clay content 10, 20, and 30 %, were made, which are close to natural marls composition. The results of XRD diffraction analysis show that in all mixtures, independent of the type, amount of clay, and the firing temperature, the cristalline phase is formed from quartz (SiO2), calcium oxide (CaO), dicalcium silicate (2CaO•SiO2) and magnesium oxide (MgO). Cement mineral – dicalcium silicate – is important in Roman cement setting process, After hydration dicalcium silicate hydrate is developed providing hydraulic properties of the binder. In the specimens fired at temperature of 900°C, after two weeks hydration XRD diffraction analysis shows cristalline phases such as quartz (SiO2), calcium hydroxide (Ca(OH)2), magnesium hydroxide (Mg(OH)2), calcite (CaCO3), calcium oxide (CaO), magnesium oxide (MgO) and dicalcium silicate hydrate (2CaO•SiO2•H2O). This is chosen to be a perspective firing temperature, because at this temperature sufficient amount of dicalcium silicate is formed.