The geological fluoroapatite single crystal was
mechanically abraded in the same way to a fine powder which
was then used for elemental analysis, X-ray diffraction, and IR
spectroscopy. Fourier-transform infrared spectroscopy (FTIR) was
carried out with a Bruker Vertex 70 instrument in KBr pellets
(range 400–4000 and 2 cm1 resolution).