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 Mudstone Uses. We have provided you with all information about Mudstone rock here. Mudstone is a fine-grained, dark gray sedimentary rock, which is formed from silt and clay and is similar to shale but has less laminations. Mudstone 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 Mudstone is white. Get to know more about Mudstone rock and characteristics of Mudstone rock in the next sections.