Sand is a granular material composed of finely divided rock and mineral particles. This collage depicts samples of nine types of sand, in rows from left to right:
- Glass sand from Kauai, Hawaii
- Dune sand from the Gobi Desert
- Quartz sand with green glauconite from Estonia
- Volcanic sand with reddish weathered basalt from Maui, Hawaii
- Biogenic coral sand from Molokai, Hawaii
- Coral pink sand from Utah
- Volcanic glass sand from California
- Garnet sand from Emerald Creek, Idaho
- Olivine sand from Papakolea, HawaiiPhotograph credit: Siim Sepp