AM_Sillimanite_6 Formula: Al2 Si O5 Name: Sillimanite Unit cell: 7.4841 7.672 5.7707 90.0 90.0 90.0 , V=331.34 Space group: PBNM (62)

Bish D L , Burnham C W , American Mineralogist , 77 (1992) p.374-379, Rietveld refinement of the crystal structure of fibrolitic sillimanite using, neutron powder diffraction data