Few gemstones are found in Wisconsin. There's no gemstone industry in the Badger State and little-to-no commercial production. Agates, however, are collected, sold and traded, primarily among amateur enthusiasts. Beyond that, Wisconsin is home to a number of gem-quality minerals, most of which have been discovered in the process of mining copper, lead and zinc. Moreover, Wisconsin boasts several "mineralogical rain forests," where rare minerals are clustered together.