Aragonite, some with sulfur, from Sicily, Italy.  Shown under white light, short wave ultraviol

Aragonite, some with sulfur, from Sicily, Italy.  Shown under white light, short wave ultraviolet, mid-wave ultraviolet, and long wave ultraviolet light.  Crazy colors.  Too bad the one on the bottom left isn’t brighter, but it’s got the best sulfur crystals.