How do you  cut slate?
 Mark the Cutting Line and Mount the Slate Slab. Find the location on the slate slab that you want to cut and use a marker pen or pencil to draw a line across it.ou can also place it on top of two other slate slabs–anything to create a stable surface will do.The area of the slate slab marked by the pencil line should be places in the center between the two wooden or slate blocks.Cutting the Slate Slab. 