Basalt is a common gray to black volcanic rock. It is usually fine-grained due to the rapid cooling of lava on the Earth's surface.

What colors does basalt come in?
Basalt colors vary from gray to black.

Where would I use basalt?
Basalt is often used in construction as well as for external tiling, due to its longevity and durability. It can also be used in external wall cladding. Broken basalt is used for paving roads and squares.