The Great Pyramid has a base measurement of ca. 750 x 750ft (≙ 230.4 x 230.4 m) and today a height of . Once it had been high, but the pyramidion and the limestone casing are completely lost due to stone robbery. The lack of the casing allows a full view of the inner core of the pyramid. It was erected in small steps by more or less roughly hewn blocks of dark limestone. The casing was made of nearly white limestone. The outer surface of the casing stones were finely polished so the pyramid shimmered in bright, natural lime-white when new. The pyramidion might have been covered in electrum, but there is no archaeological proof of that. The inner corridors and chambers have walls and ceilings made of polished granite, one of the hardest stones known in Khufu's time. The mortar used was a mixture of gypsum, sand, pulverized limestone and water.