Built of brick and stone, the mosque proper forms a rectangle having outside dimensions of from north to south and from east to west. All the four walls are veneered externally and to some extent also internally with granite stone blocks. These stones have disappeared from the southern side of the west wall because of conservation works after the destruction by the earthquake of 1897. The four exterior angles of the building are strengthened with polygonal towers, of which nine facets are visible. The cornices are curvilinear and have stone gutters to drain off the rain water from the roof. There are five arched doorways in the eastern facade and three each on the north and south walls. Corresponding to the five archways in the east wall there are five semi-circular "mihrabs" inside the west wall. The stones of most of these miharbs have disappeared.