Historical buildings suffer damage in the historical process due to various reasons. In the restoration works of damaged buildings, the interventions applied as a result of diagnoses made without adequate research, cause damage to the original materials and cause material loss. In the repair process of damaged buildings, the selection of appropriate materials is crucial in order to preserve the historical document value, protect the historical structure and extend the life of the building. Therefore, it is necessary to know the properties of the original material and the new material to be used in protection. In this scope of work; The Panaghia church, which is thought to have been built in the 5th- 6th century and located in the province of Kayseri, Tomarza district, Persek neighborhood, 'Buzluk' area, was examined. About the church with  free cross plan belonging to the Byzantine period; There is no documentation work except for his old drawings and old photographs. It is mentioned in the sources that the building was completely destroyed. A large part of the structure, which was damaged as a result of different factors such as vandalism, illegal excavations, environmental factors and the location of the building, has been destroyed. The remaining parts are standing up to the foundation level and the upper window level. On-site observations and petrographic analyzes were made to determine the construction system and building materials of the Panaghia church. For the analysis, firstly samples were taken from different parts of the building using non-destructive methods. Secondly, samples were taken from Tomarza and its surrounding quarries. Petrographic analyzes were made on the samples. The properties of the original stone samples taken from the historical building and the properties of the new stone samples extracted from the quarries were compared. The most suitable new stone alternatives for the original stone material used in the historical building were tried to be determined.