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 = 452 C
_database_code_amcsd 0006178
10.67026 10.67026 5.92616 90 90 120 P6_3/m
atom      x      y     z occ  Uiso
Ca1     1/3    2/3   .25     .0249
Ca2   .1343  .8328   .25     .0249
B     .2179  .7758   .75     .0127
Mn        0     .5     0     .0103
C         0      0 .0493  .5 .0127
O1    .0925  .4759   .25     .0378
O2    .3183  .9193   .75     .0378
O3    .3075  .4738 .5423     .0378
OC    .0582  .9153 .5583  .5 .0378