Recently took a trip to Sterling Hill Mine in New Jersey. The tour, which guides you through the tunnels where they used to mine zinc, is not too special but it starts in a great gem museum and ends in the amazing Museum of Fluorescence. This part of New Jersey is renowned for its phosphorescent stones. Meaning, that these rocks glow in neon colors when exposed to a blacklight. The museum has displays of glowing rocks under blacklight and other phosphorescent items like uranium glass, money and pottery.
There’s also a quarry field outside where you can sift through and purchase rocks by the pound. They have a little hut with a blacklight bulb where you can test rocks from the field to see if it glows, and if so, what colors it presents (orange and green are common to find). So much fun for a geology nerd like me!