Before knowing how is sandstone formed, let’s first understand what it is. One of those rocks you’ve most likely seen a hundred times without really thinking about is sandstone. It is a sedimentary rock composed primarily of feldspar and quartz particles the size of sand.
The wonderful thing about it, though, is that each sandstone has a unique history. Its origin—a desert, a riverbed, or maybe an old seabed—is revealed by its color, texture, and even the small grains.
How Is a Sandstone Formed? Understanding Its Natural Process and Composition