The definitive book on Lake Superiors agates is here. If youre a casual rock collector, you will find Agates of Lake Superior fun, interesting and beautiful. If youre a more advanced hobbyist, you will appreciate this professional and scientific resource. The book provides a thorough examination of Lake Superiors strange and unique agate varieties, as well as a critical look at agate formation theories, tips on how to find and identify agates, where to look for them and how collectible your agates may be.