Gaudefroyite
Antao S M, Hassan I
The Canadian Mineralogist 46 (2008) 183-193
Gaudefroyite, Ca8Mn3+6[(BO3)6(CO3)2O6]: high-temperature crystal structure
Locality: Wessels mine, Kalahari manganese field, South Africa
Sample: T = 25 C
_database_code_amcsd 0006168
10.60074 10.60074 5.88402 90 90 120 P6_3/m
atom      x      y     z occ  Uiso
Ca1     1/3    2/3   .25     .0105
Ca2   .1319  .8316   .25     .0105
B     .2170  .7725   .75     .0024
Mn        0     .5     0     .0020
C         0      0 .0630  .5 .0024
O1    .0919  .4734   .25     .0231
O2    .3198  .9194   .75     .0231
O3    .3085  .4758 .5395     .0231
OC    .0587  .9152 .5705  .5 .0231