What type of rock is Sigiriya rock made of?

The Sigiriya Rock is built on a granite rock formed deep in the earth's crust, a rock that is strong enough to remain intact for a long time. Archaeologists have determined that the height of the rock, from its base to its summit, is approximately 200 meters. This fortress is so mighty and grand that it remains in ruins today, mainly due to the strength of the rock from which it was built.