This well illustrated guide covers the following:

Learn how rocks and minerals are formed
Discover what to look for in the field
Decide on the best tools for the job
Prepare for successful field trips
Identify commonly encountered gems and minerals
Preserve and prepare specimens
Explore the basic aspects of lapidary

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The Rockhound's Handbook gives you the overview -- the Gem Trails books listed below take you to the locations.

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Gem Trails Guides

Detailed maps and descriptive text lead the rockhound to the best collecting sites for gems, minerals and fossils. Black and white photos aid in locating the collecting area. Stunning color photos help with specimen identification. Below are guides with maps to help you locate the gems and minerals.

Click on the books below to get more detailed information.