Deserts cover huge areas, mostly between 10-30 degrees N and S of the equator. Many of these deserts are sandy, at least partly. Good example is the Sahara — the largest desert in the world.
Ok, maybe it is second largest after Antarctica. To describe a desert sand, we first have to make clear what we are talking about. When we imagine desert sand, we probably think of sand dunes. That is what I am writing about here although dune fields cover only about 20 percent of modern desert areas.
Dune sand is generally very well-sorted. It means that all the sand grains are roughly the same size. There is almost no dust. It is blown away and deposited elsewhere, possibly as a loess deposit far away from the source area. There are also no gravel or boulders because wind is not capable of carrying such a heavy load.
There are approximately one square centimeter of sand on every photo.