Perfect for mountain climbers, hikers, and geology enthusiasts, this valuable reference covers more rocks and minerals in North America than any other available guide. Featuring a durable vinyl binding and nearly 800 full-color identification photographs, the National Audubon Society Field Guide to Rocks and Minerals is the perfect companion for any expedition. This portable guide depicts all the important rocks, gems, and minerals -- in many variations of color and crystal form -- and the natural environments in which they occur, and includes written descriptions of field marks, similar rocks and minerals, environment, areas of occurrence, and derivation of names. Includes a guide to mineral collecting and a list of rock-forming minerals.