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 = 145 C
_database_code_amcsd 0006171
10.61864 10.61864 5.89528 90 90 120 P6_3/m
atom      x      y     z occ  Uiso
Ca1     1/3    2/3   .25     .0148
Ca2   .1323  .8319   .25     .0148
B     .2164  .7720   .75     .0043
Mn        0     .5     0     .0046
C         0      0 .0587  .5 .0043
O1    .0926  .4743   .25     .0270
O2    .3199  .9196   .75     .0270
O3    .3081  .4753 .5400     .0270
OC    .0591  .9156 .5692  .5 .0270