Fluorescent Calcite | UV-reactive raw crystal cluster, natural mineral specimenFluorescent calcite specimens from West Java, Indonesia, are prized for their vivid glow under ultraviolet light. These crystals typically fluoresce brightly under long wave UV, exhibiting tones that range through pale yellow to ghostly white depending on the exact impurities present. What sets certain pieces apart is their slight phosphorescence. After the UV source is extinguished, some specimens continue to emit a faint glow for a short time. The