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Revisiting redox-driven pathways of tin cycle from source to economic deposit. [PDF]
Sci RepMichaud JA, Schmidt C, Naumova MA.
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MINERALOGICAL STUDIES OF HYDROTHERMAL DIOCTAHEDRAL MICA MINERALS
MINERALOGICAL STUDIES OF HYDROTHERMAL DIOCTAHEDRAL MICA MINERALSopenaire
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Dehydroxylation of Dioctahedral Phyllosilicates
Clays and Clay Minerals, 1980AbstractMössbauer spectroscopy of dioctahedral phyllosilicates showed that on dehydroxylation iron which originally occupied M(2) and M(l) sites became, respectively, 5- and 6-coordinated. The 6-coordinated sites are very distorted. No migration of cations occurs in the course of heating the specimens for 1–3 hr at 600°–700°C.By using a combination of ...
L. Heller-Kallai, I. Rozenson
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The variable charge of dioctahedral smectites
Journal of Colloid and Interface Science, 2013One of the most important properties of smectites is the cation exchange capacity resulting both from the structural permanent charge and the pH depending variable charge. The variable charge, in turn, mainly results from the edge aluminol groups (in the case of dioctahedral smectites).
S, Kaufhold, R, Dohrmann
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Mössbauer Spectra of Dioctahedral Smectites
Clays and Clay Minerals, 1977AbstractMössbauer spectra of 15 smectites were investigated. In these samples, ferric iron occupies both M(1) and M(2) octahedral sites, the distribution being partly determined by the relative covalency of the bonds formed.The quadrupole splittings are linearly related to b−3.
I. Rozenson, L. Heller-Kallai
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A comprehensive characterization of dioctahedral smectites
Clays and Clay Minerals, 2009AbstractThe term ‘montmorillonite’ encompasses a wide range of chemical compositions and structures. Comprehensive and reliable characterization is essential for unambiguous classification. Twenty eight purified, Na-exchanged smectites (<0.2 µm) were characterized by layer-charge measurement using the alkylammonium method, by cation exchange ...
Wolters, F. +4 more
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Clays and Clay Minerals, 1988
AbstractThe structures of 11 smectites and 2 interstratified mica/smectites containing mainly Ca2+ and Na+ as exchangeable cations in variable ratio were studied under a relative humidity of about 40%. Observed X-ray powder diffraction patterns were compared with diagrams calculated from interstratification models containing 15.2-Å Ca-smectite layers ...
Takashi Iwasaki, Takashi Watanabe
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AbstractThe structures of 11 smectites and 2 interstratified mica/smectites containing mainly Ca2+ and Na+ as exchangeable cations in variable ratio were studied under a relative humidity of about 40%. Observed X-ray powder diffraction patterns were compared with diagrams calculated from interstratification models containing 15.2-Å Ca-smectite layers ...
Takashi Iwasaki, Takashi Watanabe
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Mössbauer investigations of dioctahedral pegmatitic micas
Journal of Radioanalytical and Nuclear Chemistry Letters, 1990For the first time Mossbauer data of geochemically completely characterized and genetically exactly classified dioctahedral 2M1 micas from the pegmatitic district Alto Ligonha /Northern Mozambique/ are given. The results of the iron distribution allow to draw qualitative conclusions concerning the redox potential during the formation of the deposit.
C. Pietzsch, L. Schmidt
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Formation of Dioctahedral Vermiculite in Virginia Soils
Clays and clay minerals (National Conference on Clays and Clay Minerals), 1961AbstractThe weathering of micas to form the dioctahedral analogue of vermiculite is a common process in acid soils. Laboratory weathering of the micaceous 5–2μ fraction of parent materials of certain Virginia soils resulted in a product similar in character (whether mixtures of vermiculite and regularly and randomly interstratified mica—vermiculite, or
C. I. Rich, M. G. Cook
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Reaction Series for Dioctahedral Smectites
Clays and Clay Minerals, 1978AbstractSeveral dioctahedral clay minerals are related through reaction series. These series can be produced hydro-thermally from beidellite gel and montmorillonite by making simple changes in interlayer and solution chemistry. The series are: gel-K-beidellite-random illite/smectite-K-rectorite-illiteK-montmorillonite-K-rectorite-illiteNa ...
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