Sandstone colors

"Like uncemented sand, sandstone may be any color due to impurities within the minerals, but the most common colors are tan, brown, yellow, red, grey, pink, white, and black. Since sandstone beds often form highly visible cliffs and other topographic features, certain colors of sandstone have been strongly identified with certain regions." From en.wikipedia.org/wiki/Sandstone

That is one of only a few paragraphs I understood in the Wiki article about sandstone, a more complex kind of rock than I had imagined.