AM_Sillimanite_4 Formula: Al2 Si O5 Name: Sillimanite Unit cell: 7.503 7.739 5.804 90.0 90.0 90.0 , V=337.01 Space group: PBNM (62)

Winter J K , Ghose S , American Mineralogist , 64 (1979) p.573-586, Thermal expansion and high-temperature crystal chemistry of the Al2SiO5, polymorphs, T = 1000 deg C