Sillimanite
Bish D L, Burnham C W
American Mineralogist 77 (1992) 374-379
Rietveld refinement of the crystal structure of fibrolitic sillimanite using
neutron powder diffraction data
_database_code_amcsd 0001446
7.4841 7.6720 5.7707 90 90 90 Pbnm
atom     x     y     z occ   Uiso
Al1      0     0     0     0.0021
Al2  .1428 .3433   .25 .91 0.0031
Si2  .1428 .3433   .25 .09 0.0031
Si3  .1524 .3412   .75 .91 0.0028
Al3  .1524 .3412   .75 .09 0.0028
OA   .3607 .4069   .75     0.0017
OB   .3554 .4361   .25     0.0023
OC   .4783 .0035   .75     0.0087
OD   .1256 .2222 .5131     0.0033