Mineral with great aesthetic appeal, well-developed crystals, fluorescent under long-wave UV rays. A piece that is difficult to find in today's market, for demanding collectors and exclusive collections. The mineral from Luc Yen, a region in northern Vietnam famous for its gem and mineral deposits, stands out for its incredible aesthetics and well-developed crystals. Among the most valuable minerals from this location are those that show extraordinary fluorescence under long-wave UV rays (LW), an aspect that adds further charm to these pieces and makes them highly sought after by collectors.