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 = 384 C
_database_code_amcsd 0006176
10.65998 10.65998 5.92041 90 90 120 P6_3/m
atom      x      y     z occ  Uiso
Ca1     1/3    2/3   .25     .0224
Ca2   .1339  .8326   .25     .0224
B     .2175  .7751   .75     .0102
Mn        0     .5     0     .0088
C         0      0 .0518  .5 .0102
O1    .0928  .4759   .25     .0351
O2    .3186  .9196   .75     .0351
O3    .3079  .4746 .5419     .0351
OC    .0586  .9152 .5620  .5 .0351