Agates - few other natural formations exhibit the tremendous variety seen in these curiously banded gemstones, no two are exactly alike when it comes to color, pattern or shape. And though they are found on every continent, many well-known and significant varieties are present in North America. This book features more than 60 of the most famous, most valuable and rarest agates from Canada, the United States and Mexico. Intriguing, informative text explains the fascinating differences between agates, while compelling, true-to-life photos show each agate's special beauty.