AM_Phase-B-anhydrous_1 Formula: Si5 Mg12.364 Fe1.616 O24 Name: Phase-B-anhydrous Unit cell: 5.908 14.241 10.069 90.0 90.0 90.0 , V=847.16 Space group: PMCB (55)

Hazen R M , Finger L W , Ko J , American Mineralogist , 77 (1992) p.217-220, Crystal chemistry of Fe-bearing anhydrous phase B: Implications for transition, zone mineralogy