Basalt

This grey to dark grey stone has a blue tinge to it, hence its name. Basalt has consistent colouring, without veining, and can be seen to be quite grainy on the surface. On close inspection, you may also be able to see minute visible pores. Basalt usually comes in a matt or rough finish such as bush hammered or flamed.
Basalt can be mistaken for granite but can be treated in the same way following the TileMaster Chart.