Cuspidine
Fleet M E, Pan Y
The Canadian Mineralogist 33 (1995) 879-884
The structure of NaCa2LuSi2O7F2, a synthetic phase of the cuspidine group
_database_code_amcsd 0005460
11.024 10.303 7.391 90 109.40 90 P2_1/a
atom      x      y      z  occ Biso
Na1   .4247  .1276  .8388 .845  .67
Ca1   .4247  .1276  .8388 .155  .67
Ca2   .4262  .1308  .3409 .845  .98
Na2   .4262  .1308  .3409 .155  .98
Lu3  .30858 .40160 .52890 .845  .50
Ca3  .30858 .40160 .52890 .155  .50
Ca4   .3010  .3957  .0257 .845 1.19
Lu4   .3010  .3957  .0257 .155 1.19
Si1   .1276  .1775  .7198       .80
Si2   .1205  .1769  .1595       .85
O1    .1373  .1937  .9507      2.66
O2    .1601  .0289  .6939      1.53
O3    .1471  .0248  .2059      2.00
O4    .2403  .2726  .7134      1.47
O5    .2380  .2681  .2831      1.55
O6    .9840  .2215  .5903      1.44
O7    .9808  .2262  .1291      1.61
F1    .1127  .4916  .4465      1.13
F2    .1083  .4949  .9304      1.36