Mouser Williams collects sand from different parts of the world. He photographs his samples using a macro lens to get up close and personal, labeling their composition. This lovely sample is called Star Sand.
This sand, found only on a few beaches in southern Japan, is made up entirely of the calcified shells of tiny organisms only a few milimeters across. It is one of the more sought-after sands for sand collectors despite being readily available on eBay.
Link -via Jason Kottke
(Image credit: Flickr user Mouser Williams)