AM_Ca4Fe15Al1767O32 Formula: Ca4 Fe1.501 Al17.499 O32 Name: Ca4Fe1.5Al17.67O32 Unit cell: 20.1847 20.1847 5.6203 90.0 90.0 90.0 , V=2289.83 Space group: I-42D (122)

Kahlenberg V , Shaw C S J , Parise J B , American Mineralogist , 86 (2001) p.1477-1482, Crystal structure analysis of synthetic Ca4Fe1.5Al17.67O32: A high pressure,, spinel-related phase