Terlingua Calcite on the left and  fluorapatite from Wana, South Waziristan, Khyber-Pakhtunkhwa

Terlingua Calcite on the left and  fluorapatite from Wana, South Waziristan, Khyber-Pakhtunkhwa (formerly NWFP: North-West Frontier Province), Pakistan on the right.  Shown under short wave ultraviolet, long wave ultraviolet, mid-wave ultraviolet, and white light.  It’s interesting to me that they have opposite pink vs. blue responses to short wave vs. long wave UV.