Claystone is a type of sedimentary rock composed primarily of clay-sized particles. It forms from the accumulation of fine sediments, often in calm water environments like lakes or river deltas. Claystone is typically soft and can be easily molded when wet, making it useful in pottery and construction. This rock is often found in various colors, including gray, brown, and red, depending on its mineral content. Claystone can also serve as a source of clay for ceramics and is important in the study of geology due to its role in understanding sedimentary processes and ancient environments.