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MAS NMR study of pentacoordinated magnesium in grandidierite

Kenneth J. D. MacKenzie and Richard H. Meinhold
MAS NMR study of pentacoordinated magnesium in grandidierite
American Mineralogist (June 1997) 82 (5-6): 479-482

Abstract

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


ISSN: 0003-004X
EISSN: 1945-3027
Coden: AMMIAY
Serial Title: American Mineralogist
Serial Volume: 82
Serial Issue: 5-6
Title: MAS NMR study of pentacoordinated magnesium in grandidierite
Affiliation: New Zealand Institute for Industrial Research and Development, Lower Hutt, New Zealand
Pages: 479-482
Published: 199706
Text Language: English
Publisher: Mineralogical Society of America, Washington, DC, United States
References: 21
Accession Number: 1997-055739
Categories: Mineralogy of silicates
Document Type: Serial
Bibliographic Level: Analytic
S25°40'00" - S11°52'00", E43°00'00" - E50°30'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute.
Update Code: 199718
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