 The pyramid originally comprised six or seven steps made of irregular and roughly hewn limestone blocks and mortar , of which only three survive . This core was overlaid by casing stones of white <unk> limestone , which have been stolen in antiquity . At the time of its construction the pyramid stood 52 m ( 171 ft ) high with a base length of 78 @.@ 75 m ( 258 @.@ 4 ft ) and an inclination angle of 52 ° . 
