Carbonate-fluorapatite Perdikatsis B Materials Science Forum 79 (1991) 809-814 X-ray powder diffraction study of francolite by the Rietveld method Locality: Epirus, Greece Sample: T = 1200 C Note: Reported structure does not reproduce reported formula or bondlengths _database_code_amcsd 0014388 9.3708 9.3708 6.8880 90 90 120 P6_3/m atom x y z occ Biso Ca1 1/3 2/3 .0005 .338 1.194 Ca2 .2410 .9915 .25 .500 .447 P .3983 .3686 .25 .496 .296 O1 .3223 .4828 .25 .492 .420 O2 .5898 .4638 .25 .499 1.405 O3 .3412 .2558 .0695 1.074 F 0 0 .25 .169 4.091