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 = 59 C
_database_code_amcsd 0006169
10.60643 10.60643 5.88761 90 90 120 P6_3/m
atom      x      y     z occ  Uiso
Ca1     1/3    2/3   .25     .0119
Ca2   .1320  .8317   .25     .0119
B     .2166  .7717   .75     .0036
Mn        0     .5     0     .0030
C         0      0 .0601  .5 .0036
O1    .0923  .4738   .25     .0239
O2    .3200  .9195   .75     .0239
O3    .3082  .4755 .5398     .0239
OC    .0590  .9155 .5706  .5 .0239