If you look closely at a sample of sand, you will notice it is made of several different types of grains. The type and shape of grains in a sample of sand provide clues about the source of the sand.
! Click each image to see a larger version. Examine the grains for any clues they provide about where they formed.
International Sand Collectors Society
1. Describe the major characteristics of grains in each sample. Your description should include details about shape, color, and surface features. Make a hypothesis about the source rock for each sample.