Field guide to the gems and minerals of the Mohave and Colorado Deserts. Includes maps and photos.

Demonstrates how GPS technology can become a guide to Western gem trails focusing on the best collecting sites in Arizona, California, Colorado, Montana and several additional states. Each state area begins with an introduction and a highway map and the north latitude and west longitude along with the section/township/range, and 7.5 minute quadrangles sheet and jurisdiction are provided for each collecting site. A total of 1,360 locations are available to choose from.