Structural investigations of natural and synthetic chlorite minerals by X-ray diffraction, mössbauer spectroscopy and solid-state nuclear magnetic resonance
2006 (English)In: Clays and clay minerals, ISSN 0009-8604, Vol. 54, no 2, 252-265 p.Article in journal (Refereed) Published
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.
Place, publisher, year, edition, pages
2006. Vol. 54, no 2, 252-265 p.
27 AL NMR; CATION DISTRIBUTIONS; CHLORITE; LAYERED MINERAL; MINERAL STRUCTURE; MOSSBAUER SPECTROSCOPY; 29 SI NMR; XRD
Research subject Earth Science with specialization in Mineral Chemistry, Petrology and Tectonics
IdentifiersURN: urn:nbn:se:uu:diva-119578DOI: 10.1346/CCMN.2006.0540210OAI: oai:DiVA.org:uu-119578DiVA: diva2:300507