This beautiful and fascinating book explores the world of Montana agates, as explained by one of the foremost experts on the subject.

Drawing on his years of geological study and research of Montana agates author Tom Harmon, a native of Northeastern Montana, discusses how this type of agate formed, as well as structures, inclusions and additional features that make this variety of stone so popular.

In addition to fascinating details, this 146-page book contains nearly 400 color photographs of unique Montana agates.