Fluorapatite
Hughes J M, Cameron M, Crowley K D
American Mineralogist 76 (1991) 1857-1862
Ordering of divalent cations in the apatite structure: Crystal structure
refinements of natural Mn- and Sr-bearing apatite
sample Sr.63
_database_code_amcsd 0001421
9.3902 9.3902 6.9011 90 90 120 P6_3/m
atom       x      y      z  occ Biso
Ca1      2/3    1/3 .00086 .984 .850
Sr1      2/3    1/3 .00086 .016 .850
Ca2  -.00854 .24046    .25 .906 .792
Sr2  -.00854 .24046    .25 .094 .792
P     .36912 .39843    .25       .60
O1     .4846  .3269    .25       .95
O2     .4665  .5877    .25      1.13
O3     .2574  .3416  .0711      1.26
F          0      0    .25      2.00