Authors: Zazzi, Åsa; Hirsch, Tomas K.; Leonova, Ekaterina; Kaikkonen, Andrei; Grins, Jekabs; Annersten, Hans; Edén, Mattias

Source: Clays and Clay Minerals, Volume 54, Number 2, April 2006 , pp. 252-265(14)

Publisher: The Clay Minerals Society

Abstract:

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 as²⁷ Al 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.

Keywords: 27 AL NMR; CATION DISTRIBUTIONS; CHLORITE; LAYERED MINERAL; MINERAL STRUCTURE; MOSSBAUER SPECTROSCOPY; 29 SI NMR; XRD

Document Type: Research article

DOI: http://dx.doi.org/10.1346/CCMN.2006.0540210

Publication date: 2006-04-01

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