The 11.7 T 25Mg, 27Al, 29Si, and 11B MAS NMR spectra are reported for well-characterized grandidierite, (Mg,Fe)Al3SiBO9, which contains both Al and Mg in fivefold coordination with oxygen. The 25Mg spectrum is the first to be reported for 5Mg, 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.

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