Andalusite_3 Formula: Al2 Si O5 Name: Andalusite Unit cell: 7.8759 7.9567 5.5664 90.0 90.0 90.0 , V=348.82 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 = 800 deg C