AM_Andalusite Formula: Al2 Si O5 Name: Andalusite Unit cell: 7.798 7.9031 5.5566 90.0 90.0 90.0 , V=342.44 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 = 25 deg C