Isle Royale Greenstone: Exploring Michigan's State Gemstone

Isle Royale Greenstones are forever going to be a part of Michigan's rich cultural and mining history. Most of the gem-grade greenstones used in jewelry today come from tailings of old mines in Michigan's Keweenaw Peninsula. Searching for these mysterious and rare greenstones has always been a challenge to people.

This book is for anyone interested in planning a trip to find greenstones and offers important insights into discovery, identification, trip-planning, and advance polishing and fin...