AM_Mullite_5
Formula: Al1.97 Cr.25 Si.78 O5.22
Name: Mullite
Unit cell: 7.56712 7.70909 2.90211 90.0 90.0 90.0 , V=169.30
Space group: PBAM (55)

Fischer R X , Schneider H , American Mineralogist , 85 (2000) p.1175-1179, Crystal structure of Cr-mullite, Sample: fixed slit, monochromatic