Fermorite
Hughes J M, Drexler J W
Neues Jahrbuch fur Mineralogie, Monatshefte 1991 (1991) 327-336
Cation substitution in the apatite tetrahedral site:
crystal structures of type hydroxylellestadtite and type fermorite
Locality: Sitipar deposit, India
_database_code_amcsd 0014858
9.5935 9.5966 6.9754 90 90 119.971 P2_1/m
atom       x      y     z  occ Biso
Ca1   .33340 .66663 .0016  .84 1.05
Sr1   .33340 .66663 .0016  .16 1.05
Ca2a  .00702 .25046   .25  .84 1.04
Sr2a  .00702 .25046   .25  .16 1.04
Ca2b  .74963 .75684   .25  .84 1.01
Sr2b  .74963 .75684   .25  .16 1.01
Ca2c  .24318 .99288   .25  .84 1.02
Sr2c  .24318 .99288   .25  .16 1.02
As5+1 .63019 .02816   .25  .49  .65
P1    .63019 .02816   .25  .48  .65
As5+2 .97194 .60212   .25  .49  .66
P2    .97194 .60212   .25  .48  .66
As5+3 .39803 .36981   .25  .49  .65
P3    .39803 .36981   .25  .48  .65
O1a    .3261  .4883   .25      1.57
O1b    .5120  .8377   .25      1.64
O1c    .1625  .6747   .25      1.68
O2a    .5921  .4671   .25      1.90
O2b    .5329  .1250   .25      1.84
O2c    .8750  .4074   .25      1.96
O3a    .3432  .2558 .0667      2.43
O3b    .7446  .0879 .0664      2.37
O3c   -.0875  .6571 .0665      2.40
OH    -.0018 -.0001  .191 .655  2.3
F       .002   .000   .25 .345  2.0