Lake Superior Copper Agates: Introduction to the World's Most Spectacular Agates Book by Jack Hobart Lake Superior Copper Agates, Introducing the World's Most Spectacular Agates , the first book about these unique agates. They have only been actively collected for little more than ten years. Nearly all come from portions of three 100-year old copper mine tailings in the Keweenaw of Northern Michigan. Not only have their agate patterns changed to pure, glittering copper, some of them even include metallic silver! In a few, individual copper bands can extend outside their host matrix by half an inch! Some appear to have agate eyes and banding that is etched in nodules of pure copper. There is so much associated mineralization, that colors and patterns are far more varied than in other Lake Superior agates. They can even include gem quality chlorastrolite, the state gemstone of Michigan.The book has 20 chapters, including agate types never seen before. Many pictures show reflections from their glittering copper regions. Even agates without visible copper have minerals, crystal structures and geodes seldom seen in other agates. There are so many eyes that its chapter on eye agates is quite small, deferring a more complete coverage to the companion book, Copper Agate Eyes.Since there are significant difference in agates from the three nearby mines, each image lists its origin as well as its dimensions.This photo-filled book includes enough text to explain the features, but the words don't get in the way of the photography. 88 pages