At the Rochester Mineralogical Symposium in 2022 Madeline Murchland gave a very nice presentation about fluorescence spectroscopy and zoning in apatite. Here is a recording of her talk.
Spodumene var. Kunzite Dara-I-Pech
This is the tip of a large kunzite crystal (130 * 30 *5 mm) in halogen light, 365 nm Convoy S2+, and MW-UV respectively. When lighted...