Agates of Lake Superior: Stunning Varieties and How They Are Formed
By Dan and Bob Lynch
Each type of the Lake Superior region's agates are discussed in-depth, with details ranging from characteristics and formation to distribution and rarity. Multiple photographs accompany each write-up. Also includes a thorough explanation of agates and why they are unique, a critical look at agate formation theories, and tips on how to find and identify agates and where to look for them.