Scientific American
Scientific American Slideshow: A Grain of Sand: Nature's Secret Wonder
Get an up-close microscopic view of grains of sand from various locations around the world in this slideshow from Scientific American.
Other
Mainland Aggregates, Ltd: Many Uses of Sand
This infographic includes a calculation for how many grains of sand are on the Earth. It discusses what sand is, its history of use by humans, and its many uses in modern times.