Before every rockhounding trip, we do our homework. We research locations, study maps, save coordinates, check access, and make lists of what we're supposed to find when we get there. By the time we leave home, our maps are covered with little pins, and we have enough research to convince ourselves that we know exactly what we're doing. Then we get there and discover that apparently the rocks had changed the assignment. Our August trip through Montana, Wyoming, and South Dako

Dark, understated, and anything but ordinary, Black Tourmaline has a fascinating history and some surprising scientific properties. Discover what makes this popular stone unique, why it has long been used for protection and grounding, and the many ways people use it today.

What do Herkimer Diamonds, Lake Superior Agates, Oregon Sunstone, and Bisbee Turquoise have in common? They're among the most iconic rocks, minerals, gemstones, and fossils found in the United States. In celebration of America's 250th birthday, we're taking a coast-to-coast look at ten legendary specimens that have inspired collectors, rockhounds, and gemstone enthusiasts for generations.