Hexagonal crystals of fluorapatite from Wana, South Waziristan, Khyber-Pakhtunkhwa (formerly NWFP: N
Hexagonal crystals of fluorapatite from Wana, South Waziristan, Khyber-Pakhtunkhwa (formerly NWFP: North-West Frontier Province), Pakistan, showing different colors under different wavelengths of ultraviolet light. Shown under mid-wave ultraviolet light, white light, short wave ultraviolet, and long wave ultraviolet. -- source link
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