Rocks are naturally occurring solids which are composed of minerals & have been used by humans since ages. From Stone Age, rocks are used for various purposes. Also, the metals and minerals found in rock play an important role in our life. Get to know all the Claystone Uses. We have provided you with all information about Claystone rock here. Claystone is a fine-grained, dark gray to pink sedimentary rock which mainly consists of compacted and hardened clay. Claystone is available in black, blue, brown, green, grey, orange, red, white, yellow colors. The streak of a rock is the color of powder produced when it is dragged across an unweathered surface. The streak of Claystone is white. Get to know more about Claystone rock and characteristics of Claystone rock in the next sections.