List Of Minerals And Gemstones Found In Michigan! Minerals and Gemstones Found in Michigan The 11th largest state, Michigan is comprised of two separate peninsulas. The Upper Peninsula is known for its lush natural resources, including the state's gemstone, Isle Royal Greenstone. According to the USGS, the state contains 1853 mines. Most of Michigan's gemstones … [Read more...] about List Of Minerals And Gemstones Found In Michigan!