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 = 93 C
_database_code_amcsd 0006170
10.61129 10.61129 5.89062 90 90 120 P6_3/m
atom      x      y     z occ  Uiso
Ca1     1/3    2/3   .25     .0133
Ca2   .1323  .8319   .25     .0133
B     .2169  .7728   .75     .0037
Mn        0     .5     0     .0037
C         0      0 .0610  .5 .0037
O1    .0921  .4738   .25     .0255
O2    .3198  .9196   .75     .0255
O3    .3083  .4755 .5401     .0255
OC    .0589  .9153 .5697  .5 .0255