Wet saw. Squirts water on the blade to keep it from heating up. Cuts through anything. Fast. Scary. Safety glasses adviseable. This one is borrowed. Many thanks to the guy who is letting us use it! Makes me think up things to do with it. Slate tile vases. Slate tile boxes. Could you cut a flagstone into slices? What could you do with them? Could you cut a stone in half? Oh, the possibilities!