Claystone is one of the important type of rocks. If we have to define Claystone in general, Claystone is a fine-grained, dark gray to pink sedimentary rock which mainly consists of compacted and hardened clay. Claystone comes under Sedimentary Rocks. All Sedimentary Rocks have similar properties and formation process. Along with Claystone Definition, know more about the History of Claystone, Etymology of Claystone in next sections.