Shale and slate are two very similar types of stones found naturally along split bedding lines. The difference between these rocks can be difficult to pinpoint by looking at the stones. Slate is a more pressurised version of shale and, therefore, a little more durable. Shale is crumbly and usually breaks apart with the slightest amount of pressure. Because slate requires more pressure to break than the shale, it is used in landscaping and home projects as walkways.