By: National Audubon Society
This first all-photographic field guide features 794 full-color images of all the important rocks, gems, and minerals of North America, showing their many variations of color and crystal form. The text provides descriptions of 200 minerals (including 20 classified as gemstones) and 40 rocks, as well as descriptions of the natural environments where they occur. Photographically organized by color for quick and easy identification, this guide has twice as many descriptions and color plates as any other rock and mineral guide. Also included are guidelines for collecting procedures, key to identification, and a mineralogical glossary.