AM_Phase-B-superfluorous Formula: Si3 Mg10 O14 F4 Name: Phase-B-superfluorous Unit cell: 5.05 13.969 8.64 90.0 90.0 90.0 , V=609.50 Space group: PNNM (58)

Hazen R M , Yang H , Prewitt C T , Gasparik T , American Mineralogist , 82 (1997) p.647-650, Crystal chemistry of superfluorous phase B (Mg10Si3O14F4): Implications for the, role of fluorine in the mantle