Local name in Iran: Lashotor Quarry location: South of Isfahan, Iran Pietra Grey Marble quarries which are located in south of Isfahan and very close to city, have provided this possibility that this stone with strong distinctive white veins in different directions and thicknesses which is highly resistant and beautiful to be installed as step treads and interior walls, be used in most of monuments in Isfahan city. Using this stone for the façade of buildings is not recommended since its black color changes to grey due to sunlight. One of the disadvantages of this building stone is the accumulation of dark veins that may be evacuated during the time and destroys the beautiful look of stone.