Fig. 6

Petrographic images of samples from the Mor Yakub Church. 1–2–3 The aggregates in the mortar samples have a rounded structure. Calcite (C), Quartz (Q), Limestone (K), (Op) and a small amount of Plagioclase (Pl) in the aggregate matrix are observed in the mortar samples. 5–6 Quartz (Q), Limestone (K), opaque minerals (Op) in the aggregate matrix of the plaster samples and organic added parts at the rate of 1% of the total aggregate in the structure of the lower layers of the samples. In addition, rounded and broken/angular aggregates are seen in the plaster samples. 3–4–5 Brick pieces are seen in the aggregate structure of the upper layers of the samples at the rate of 1% of the total aggregate