AM_Grandidierite_5 Formula: (Mg.55 Fe.45) Al3 B Si O9 Name: Grandidierite Unit cell: 10.3403 11.0332 5.7655 90.0 90.0 90.0 , V=657.77 Space group: PBNM (62)

Dzikowski T J , Groat L A , Grew E S , American Mineralogist , 92 (2007) p.863-872, The geometric effects of VFe2+ for VMg substitution on the crystal structures, of the grandidierite-ominelite series, Sample: G2, Locality: Andrahomana, Madagascar