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 = 486 C
_database_code_amcsd 0006179
10.67467 10.67467 5.92984 90 90 120 P6_3/m
atom      x      y     z occ  Uiso
Ca1     1/3    2/3   .25     .0263
Ca2   .1345  .8328   .25     .0263
B     .2190  .7789   .75     .0183
Mn        0     .5     0     .0117
C         0      0  .050  .5 .0183
O1    .0919  .4752   .25     .0397
O2    .3191  .9189   .75     .0397
O3    .3068  .4731 .5422     .0397
OC    .0608  .9165 .5534  .5 .0397