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 = 298 C
_database_code_amcsd 0006174
10.64342 10.64342 5.91056 90 90 120 P6_3/m
atom      x      y     z occ  Uiso
Ca1     1/3    2/3   .25     .0199
Ca2   .1332  .8323   .25     .0199
B     .2167  .7741   .75     .0097
Mn        0     .5     0     .0073
C         0      0 .0549  .5 .0097
O1    .0928  .4753   .25     .0318
O2    .3188  .9193   .75     .0318
O3    .3078  .4747 .5413     .0318
OC    .0591  .9159 .5661  .5 .0318