Solid-state MAS NMR study of pentameric aluminosilicate groups with 180° intertetrahedral Al-O-Si angles in zunyite and harkerite

Solid-state MAS NMR study of pentameric aluminosilicate groups with 180° intertetrahedral Al-O-Si angles in zunyite and harkerite

The minerals zunyite, Al13Si5O20(OH,F)18Cl, and harkerite, Ca24Mg8[AlSi4(O,OH)16]2(CO3)8(BO3)8(H2O,Cl), have been studied by means of solid state 27Al MAS NMR. Zunyite contains Si5O16 pentamers and harkerite contains AlSi4(O,OH)16 pentamers. These pentameric groups are unique because their T-O-Si an...

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Veröffentlicht in:The American mineralogist 1995-02, Vol.80 (1-2), p.39-45
Hauptverfasser: Dirken, Peter J, Kentgens, Arno P. M, Nachtegaal, Gerda H, van der Eerden, Ad M. J, Jansen, J. Ben H
Format: Artikel
Sprache:eng
Schlagworte:
aluminosilicates
coordination
crystal chemistry
crystal structure
experimental studies
halides
harkerite
Mineralogy
nesosilicates
NMR spectra
orthosilicates
polyhedra
silicates
sorosilicates
space groups
spectra
symmetry
tetrahedra
zunyite
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Beschreibung
Zusammenfassung:The minerals zunyite, Al13Si5O20(OH,F)18Cl, and harkerite, Ca24Mg8[AlSi4(O,OH)16]2(CO3)8(BO3)8(H2O,Cl), have been studied by means of solid state 27Al MAS NMR. Zunyite contains Si5O16 pentamers and harkerite contains AlSi4(O,OH)16 pentamers. These pentameric groups are unique because their T-O-Si angles are almost 180°.
ISSN:0003-004X
1945-3027
DOI:10.2138/am-1995-1-205