AM_Mullite_7 Formula: K.335 Al3 O4.665 Name: Mullite Unit cell: 7.6934 7.6727 2.93231 90.0 90.0 90.0 , V=173.09 Space group: PBAM (55)

Fischer R X , Schmucker M , Angerer P , Schneider H , American Mineralogist , 86 (2001) p.1513-1518, Crystal structures of Na and K aluminate mullites, Sample: K