This isn’t to say stone is necessarily hard to clean. It just requires a little more elbow grease than a glass mosaic does. The pits and grooves make it more challenging to wipe down, especially because dirt and scum can get caught in between.
You also have to be selective with your cleaning products. Natural stone can discolor when exposed to certain chemicals. Warm water or a special stone cleaner will usually do the trick, but always check manufacturer guidelines before you bust out your cleaning supplies.