Sillimanite
Taylor W
Zeitschrift fur Kristallographie 68 (1928) 503-521
The structure of sillimanite and mullite.
_cod_database_code 1011204
_database_code_amcsd 0018074
7.43 7.58 5.74 90 90 90 Pbnm
atom    x    y   z
Al1     0    0   0
Al2  -.14  .33 .25
Si1   .18 -.35 .25
O1    .11  .12 .25
O2    -.1 -.16 .25
O3    .08  .46 .25
O4    .15 -.18   0