Gritstone is one of the important type of rocks. If we have to define Gritstone in general, Gritstone or grit is a hard, coarse-grained, siliceous sandstone. Gritstone comes under Sedimentary Rocks. All Sedimentary Rocks have similar properties and formation process. Along with Gritstone Definition, know more about the History of Gritstone, Etymology of Gritstone in next sections.