AM_Grandidierite_2 Formula: (Mg.818 Fe.182) Al3 B Si O9 Name: Grandidierite Unit cell: 10.3317 10.9904 5.7634 90.0 90.0 90.0 , V=654.43 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: G4, Locality: Sahakondra, Ampamatoa, Madagascar