Sandstone is a sedimentary rock composed mainly of sand sized particles.
Some Sandstones are resistant to weathering yet are strangely easy to work. This makes sandstone a common building and paving material. Due to the hardness of the individual grains, uniformity of grain size and friability of their structure, some types of sandstone are excellent materials from which to make Grindstones, for sharpening blades and other implements.
Non-friable sandstone (e.g. Gritstone) can be used to make grindstones for grinding grain.