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 = 401 C
_database_code_amcsd 0006177
10.66317 10.66317 5.92221 90 90 120 P6_3/m
atom      x      y     z occ  Uiso
Ca1     1/3    2/3   .25     .0231
Ca2   .1341  .8326   .25     .0231
B     .2171  .7750   .75     .0101
Mn        0     .5     0     .0092
C         0      0 .0518  .5 .0101
O1    .0925  .4758   .25     .0362
O2    .3185  .9195   .75     .0362
O3    .3079  .4744 .5419     .0362
OC    .0582  .9154 .5608  .5 .0362