Sandstone is a popular sedimentary rock and covers up to 10% to 20% of all the sedimentary rocks. Most common of surface rocks is sedimentary rocks. Composition of sandstone is shale, mudstone, and siltstone. Sizes and colours of sandstones vary. Granular in appearance, porous at times are sandstones. Bonding of sand particles together leads to the formation of the sand stones. Different patterned sandstones are available.