A necessity of compatible material to historical romancement for restoration needs has led to research of artificially made binders from mixtures of clay and dolomite. Low temperature hydraulic binder or so called dolomitic romancement synthesis of mixture composed from local Quaternary period clay and dolomite (both in powder state) in mass ratio 24:76 is discussed in this paper. The chemical composition of the raw materials was analyzed. Specimens were prepared by homogenizing the mixture of requisite amounts of clay and dolomite in dry state and shaping samples measuring 56x26x6 mm by semidry pressing. After firing at temperatures between 650 and 1050°C crystalline phases formed in samples were determined by XRD. Afterwards, water was added to the samples and formation of new crystalline phases was detected in the period of 28 days. Natural dolomitic marl was treated at the same conditions in order to compare the crystalline phases formed in naturally and artificially made binders. The results of XRD analysis show that crystalline phases of synthesized composition after firing are equal to crystalline phases in dolomitic marl fired at the same temperature. The main crystalline phases are quartz (SiO2), calcium oxide (CaO), dicalcium silicate (2CaO•SiO2), tricalcium aluminate (3CaO•Al2O3), gehlenite (2CaO•Al2O3•SiO2) and magnesium oxide (MgO). Chemical and mineralogical composition that is close to historical material is one of the main requirements for restoration materials as they provide compatibility.