During the Persian Empire (sixth to seventh centuries AD), stones were the main construction materials used in the construction of large and small buildings at places of higher altitudes in Iran. These buildings include many architectural complexes and archeological sites such as Persepolis and Pasargadae constructed during the reign of the Achaemenid period. Other ancient stone buildings of Iran include Sassanid stone buildings located in the south of Iran such as the Palace of Ardashir Pāpakan, Firuzabad, Bishapur, and Qal’eh Dokhtar (Dokhtar Castle). Other examples include Takht-e Soleymān in the northern Iran as well as some mansions to the west of the country such as Arch of Ctesiphon and Khusrow Palace in Qasr Shirin County.
Extensive use of stone in the historical architecture of Iranian highlands is rooted in the existence of raw materials (especially limestone and igneous rocks) in the Zagros Mountains, a long mountain range stretching from the northwestern Iran (Azerbaijan) to vast areas of southeastern Turkey and northern Iraq. This mountain range crosses through Iran along its western border and finally reaches the shores of Persian Gulf.
Stone-related scientific topics such as rock mining activities and studying origins of stone raw materials used in ancient constructions have widely been studied across the world. These studies comprise one of the important topics in multidisciplinary researches in the field of archeology. Researches are typically divided into two categories namely studies on the stones used in the construction of buildings and researches on decorative stones, stone tools and precious stones. With the development of advanced archaeological, geological, mineralogical and geochemical techniques used for analyzing ancient materials, archaeologists from around the world began to conduct researches on origins of stones and raw materials used in ancient buildings particularly stone and decorative blocks.