What stone was used for the walls of the King's Chamber?

Granite was used for the walls of the Great Pyramid’s King’s Chamber.

The chamber is faced entirely with granite, a hard igneous stone that ancient Egyptian builders transported from distant quarries. Its walls consist of five carefully fitted courses of large, uninscribed blocks. The choice of granite was both practical and symbolic: it was exceptionally durable and conveyed the permanence expected of a royal burial chamber.

The King’s Chamber is the highest of the Great Pyramid’s three main chambers. It measures about 20 royal cubits east to west and 10 royal cubits north to south. Its flat roof is formed by nine massive stone slabs weighing approximately 400 tons in total. Above it are five relieving chambers, designed to reduce the load pressing down on the chamber roof.

Visitors sometimes confuse the chamber’s wall material with the pyramid’s main building material. Most of the Great Pyramid’s core consists of limestone, while granite was concentrated in important interior elements, including the King’s Chamber, its roof beams and the sarcophagus. The sarcophagus itself was carved from a single granite block.