AM_Andalusite_4 Formula: Al2 Si O5 Name: Andalusite Unit cell: 7.8976 7.9735 5.5695 90.0 90.0 90.0 , V=350.72 Space group: PNNM (58)

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