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Clays and Clay Minerals; April 2006; v. 54; no. 2; p. 252-265; DOI: 10.1346/CCMN.2006.0540210
© 2006 Clay Minerals Society
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STRUCTURAL INVESTIGATIONS OF NATURAL AND SYNTHETIC CHLORITE MINERALS BY X-RAY DIFFRACTION, MÖSSBAUER SPECTROSCOPY AND SOLID-STATE NUCLEAR MAGNETIC RESONANCE

Åsa Zazzi1, Tomas K. Hirsch2,{dagger}, Ekaterina Leonova2, Andrei Kaikkonen2, Jekabs Grins3, Hans Annersten4 and Mattias Edén2,*

1 Department of Chemistry, Royal Institute of Technology, SE-100 44 Stockholm, Sweden
2 Physical Chemistry Division, Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden
3 Inorganic Chemistry Division, Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden
4 Department of Earth Sciences, Uppsala University, SE-752 36 Uppsala, Sweden

* E-mail address of corresponding author: mattias{at}physc.su.se

The structures of one synthetic and two natural chlorites of the chlinochlore type were explored using X-ray diffraction, magic-angle spinning nuclear magnetic resonance (NMR) and Mössbauer spectroscopy. Rietveld refinements indicated that all structures are of the trioctahedral ordered IIb polytype. Mössbauer spectra provided the ratio IIFe/IIIFe but gave no evidence for the presence of IIIFe in the brucite-like sheet. We also report unit-cell parameters, Mössbauer isomeric shifts, 29Si NMR chemical shifts as well as 27Al isotropic shifts and quadrupolar coupling parameters. Very broad 29Si NMR peaks from the natural samples prevented us from obtaining accurate information on the Si-Al ordering in the tetrahedral sheets; the limitations of 29Si NMR as applied to natural chlorites are discussed. High-resolution 3QMAS NMR resolved the 27Al signal of the M4 octahedral site in the brucite-like sheet from the other three Al signals of crystallographically inequivalent octahedral positions.

Key Words: 27Al NMR • Cation Distributions • Chlorite • Layered Mineral • Mineral Structure • Mössbauer Spectroscopy • 29Si NMR • XRD






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