The Franklin Mine and Sterling Hill Mine are famous mineral mines located in New Jersey, known for their rich deposits of zinc and unique fluorescent minerals. The Franklin Mine operated from the 1800s until the 1950s, while the Sterling Hill Mine was active until the 1980s. Both sites are renowned for their diverse mineralogy, including over 350 different minerals. Today, the Franklin and Sterling Hill mines are popular tourist attractions and educational sites. The Franklin Mineral Museum showcases the area's geological history and the stunning fluorescent minerals found in the mines, making it a valuable resource for mineral enthusiasts and researchers alike.