This book documents what is likely the most complete collection of agates worldwide. It contains pictures of more than 1250 of the choicest and rarest specimens of sagenite, plume, and banded agate along with some other fine lapidary materials from Pat McMahan's personal collection. The specimens featured in the book come from over 300 locations world-wide. Most of the agates pictured in this book are self-collected by the author. These specimens were collected from 19 states in the Untied States, Mexico, Argentina, Canada, and Alaska. Also included are interesting personal collecting stories, prospecting techniques, and mining history of various locations.