AM_Grandidierite_4
Formula: (Mg.666 Fe.334) Al3 B Si O9
Name: Grandidierite
Unit cell: 10.336 11.0148 5.7657 90.0 90.0 90.0 , V=656.42
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: G1, Locality: Karibe area, Zimbabwe