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 = 247 C
_database_code_amcsd 0006173
10.63402 10.63402 5.90520 90 90 120 P6_3/m
atom      x      y     z occ  Uiso
Ca1     1/3    2/3   .25     .0183
Ca2   .1330  .8323   .25     .0183
B     .2161  .7728   .75     .0068
Mn        0     .5     0     .0064
C         0      0 .0581  .5 .0068
O1    .0927  .4747   .25     .0304
O2   .31890  .9191   .75     .0304
O3    .3079  .4749 .5409     .0304
OC    .0591  .9160 .5669  .5 .0304