Apatite-(CaF)
Hughes J M, Cameron M, Mariano A N
American Mineralogist 76 (1991) 1165-1173
Rare-earth-element ordering and structural variations in natural
rare-earth-bearing apatites
sample from the Oka carbonatite
_database_code_amcsd 0001379
9.3995 9.3995 6.8941 90 90 120 P6_3/m
atom      x      y     z  occ Biso
Ca1     2/3    1/3 .0011 .980 .893
Na1     2/3    1/3 .0011 .005 .893
Ce1     2/3    1/3 .0011 .015 .893
Ca2  .99212 .24276   .25 .955 .842
Ce2  .99212 .24276   .25 .045 .842
P    .36875 .39813   .25 .947  .57
Si   .36875 .39813   .25 .053  .57
O1    .4849  .3269   .25       .96
O2    .4659  .5873   .25      1.08
O3    .2573  .3421 .0705      1.32
F         0      0   .25  .74  2.7
OH        0      0  .302  .13  1.3