AM_Sillimanite_5 Formula: (Al1.98 Fe.02) Si O5 Name: Sillimanite Unit cell: 7.479 7.67 5.769 90.0 90.0 90.0 , V=330.93 Space group: PBNM (62)

Peterson R C , McMullan R K , American Mineralogist , 71 (1986) p.742-745, Neutron diffraction studies of sillimanite