Cutting Natural Stone Tiles.
There are a number of methods and tools used in the installation of tiles. For softer tile like ceramic tile and some types of glass the most common methods involve scoring and snapping or using a pair of nippers with a carbide tipped pencil.
However, these methods are inadequate when cutting natural stone tiles. Unlike ceramic tile, soft glass, and ever some softer porcelains, using a tile cutter or tile snips are not going to do a lot when it comes to cutting natural stone. Most natural stone tile are too hard and dense to be snapped, without extreme pressure. The few stone tile that might snap without that amount of pressure may not fracture cleanly. For example, slate tiles will fracture along many different layers, resulting in a jagged cut. Similarly, standard nippers do not have the jaw strength necessary to cut through natural stones like granite. And, they crush more brittle or fragile stone.