Basalt

==Basalt is an extrusive, igneous rock. The colour is grey to black. Basalt is not only formed on Earth, it's formed on the Moon, Mars, Venus and on the asteroid Vesta. The word " Basalt " comes from late latin and egyptian. Basalt is used for construction, making cobblestones and making statues. Basalt is one of the most common rock in the world.==