Only operating diamond mine in U.S. 2. Fee digging open to public. E. Tourmaline 1. Crystal development of bicolored tourmaline. Causes the crystal to clarify.
Color gets redder and redder in transition zone.
Blue cap on red tourmaline. Sapphires found in placer deposits. Gravel bars found 200 feet above present river. Mined by bulldozers and then examined in tables with screens. Also found In basalt flows in Hawaii.