AM_Al4B2O9 Formula: Al8 B4 O18 Name: Al4B2O9 Unit cell: 14.8056 5.5413 15.0531 90.0 90.913 90.0 , V=1234.83 Space group: C12/M1 (12)

Fischer R X , Kahlenberg V , Voll D , MacKenzie K J D , Smith M E , Schnetger B , Brumsack H-J , Schneider H , American Mineralogist , 93 (2008) p.918-927, Crystal structure of synthetic Al4B2O9: A member of the mullite family closely, related to boralsilite