What type of stone is the sarcophagus in the King's Chamber made of?

The sarcophagus in the King's Chamber is made of red granite.

The massive coffin is carved from a single block of granite and was placed in the chamber before the pyramid's upper roof was completed. It is rectangular, hollowed out inside, and has grooves designed to hold a sliding lid. The lid is now missing, and the sarcophagus was found broken open when it was rediscovered in the medieval period.

The King's Chamber itself is also faced with granite, which can cause a common mix-up: the answer is not simply “granite” as a general description, but red granite specifically. Most of the Great Pyramid's core consists of limestone, while granite was reserved for important interior spaces and structural elements.

The sarcophagus is too large to have been hauled through the pyramid's completed passages, suggesting that it was installed while the building was still under construction. Tool marks on its surface are consistent with ancient copper saws and tubular drills.