AM_Sillimanite_3 Formula: Al2 Si O5 Name: Sillimanite Unit cell: 7.4998 7.7255 5.7978 90.0 90.0 90.0 , V=335.92 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 = 800 deg C