Granite

Granite can be seen on the map and in game as lighter colored rock. 20 granite is needed to make 1 Shaped granite.

Granite is gathered through the tunnel digging commands, in piles of up to 40, dependant on the tunnel composition. (Underground tunnels can give other resources along with the granite)

Life is Feudal: Your Own Notes
The only definitively known location where you can find Granite in the world right now is at the big mountain in the center of the island.

Granit Granite