What grain sizes are most common in dune sand?

Common dune sands typically feature median grain diameters ranging from 0.02 to 0.04 cm (0.008 to 0.016 inch), with a maximum common range of 0.01 to 0.07 cm.1

More specifically, dune sands globally tend to be fine-sand-sized, with clast diameters between 1/4 and 1/8 of a millimeter, as particles of this dimension are the most easily transported by wind. Most dune sands are well sorted, meaning the particles within a sample are of a very similar size. While dune sands are generally well sorted, they can exhibit positive skewness, characterized by a tail of finer grains.21