Minecraft wiki entry for Building_a_metropolis, associated text: Mineral: Create your city using only various rock and mineral blocks and their derivatives. For lighting, glowstone is recommended as it is currently the only light-emitting rock in the game. For doors, you can use iron doors connected to stone buttons and stone or metal pressure plates. Note that completely avoiding organic materials in construction can be very difficult, as many functional furniture, most notably crafting tables, are made from wood.