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The 11.7 T  25 Mg,  27 Al,  29 Si, and  11 B MAS NMR spectra are reported for well-charac­terized grandidierite, (Mg-Fe)Al 3 SiBO 9 . which contains both Al and Mg in fivefold coor­dination with oxygen. The  25 Mg spectrum is the first to be reported for  5 Mg, and exhibits a quadrupolar lineshape from which the nuclear quadrupolar coupling constant (3.8 ± 0.1 MHz), the asymmetry parameter (0.6 ± 0.05). and the isotropic chemical shift (55 ± 2 ppm) were derived by spectral simulation. These spectroscopic parameters are discussed in terms of the crystallographic geometry of the fivefold-coordinated site.

MAS NMR study of pentacoordinated magnesium in grandidierite