NaY9(SiO4)6O2 Gunawardane R P, Howie R A, Glasser F P Acta Crystallographica B38 (1982) 1564-1566 Structure of the oxyapatite NaY9(SiO4)6O2 Note: apatite structure _database_code_amcsd 0009765 9.334 9.334 6.759 90 90 120 P6_3/m atom x y z occ Biso B(1,1) B(2,2) B(3,3) B(1,2) B(1,3) B(2,3) Na2 1/3 2/3 -.0019 .25 .711 .0034 .0034 .0019 .0017 0 0 Y2 1/3 2/3 -.0019 .75 .711 .0034 .0034 .0019 .0017 0 0 Y1 .2375 .0042 .25 .706 .0030 .0034 .0022 .00145 0 0 Si .3723 .3994 .25 .26 O1 .2486 .3389 .4380 1.19 O2 .4868 .3171 .25 .98 O3 .5252 .4013 .75 .83 O4 0 0 .25 1.2