Apatite-(CaF) Fleet M E, Pan Y American Mineralogist 82 (1997) 870-877 Site preference of rare earth elements in fluorapatite: Binary (LREE+HREE)- substituted crystals Sample: La,Gd-FAp _database_code_amcsd 0001938 9.3940 9.3940 6.8967 90 90 120 P6_3/m atom x y z Biso Ca1 2/3 1/3 .00040 .81 Ca2 .99093 .24106 .25 .703 P .36875 .39774 .25 .475 O1 .4838 .3256 .25 .93 O2 .4667 .5869 .25 1.11 O3 .2561 .3405 .0715 1.31 F 0 0 .25 2.46