Britholite-(Gd)
Hughes J M, Mariano A N, Drexler J W
Neues Jahrbuch fur Mineralogie, Monatshefte 1992 (1992) 311-319
Crystal structures of synthetic Na-REE-Si oxyapatites, synthetic monoclinic britholite
Locality: synthetic
_database_code_amcsd 0014863
9.410 9.413 6.8740 90 90 120.01 P2_1
atom       x      y      z  occ Biso
Gd1a  .33358 .66488 -.0003 .636  .41
Na1a  .33358 .66488 -.0003 .364  .41
Gd1b  .33300 .66820  .5005 .821  .88
Na1b  .33300 .66820  .5005 .179  .88
Gd2a -.00843 .23358  .2516 .985 .450
Na2a -.00843 .23358  .2516 .015 .450
Gd2b  .23361 .24200  .7515 .983 .444
Na2b  .23361 .24200  .7515 .017 .444
Gd2c  .24197 .00841  .2531 .980 .426
Na2c  .24197 .00841  .2531 .020 .426
Si1    .0278  .6288    .25       .38
Si2    .3718  .3990   .253       .45
Si3    .6007  .9720   .259       .43
O1a    .8306  .5146   .249      1.04
O1b    .4854  .3164   .264       .93
O1c    .6840  .1689   .258      1.09
O2a    .4016  .8762   .262       .88
O2b    .4739  .5971   .249       .88
O2c    .1252  .5261   .258       .71
O3a    .6405  .8971   .058        .5
O3b    .6796  .9217   .433        .7
O3c    .2555  .3590   .057        .7
O3d    .2422  .3214   .433        .7
O3e    .0794  .7571   .078        .6
O3f    .1042  .7460   .455        .9
O      .0007  .0004   .231  .81 1.40
F      .0007  .0004   .231  .19 1.40