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. -- source link
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