Fig. 11

a SEM microscopic examination and micro structure of the backing limestone blocks of Mykerinos pyramid. The composite structure of the stone is obvious where the disconnecting between the quartz and calcite grains is clear, also the abundance of salt content inside the pores and cracks between grains. Deterioration of stone grain surface as a result of the weathering and mechanical factors. b EDX spectrum from the previous image of limestone grains of the backing limestone of Mykerinos pyramid. A strong calcium signal is observed