MINERALOGICAL COMPOSITION AND DISTRIBUTION OF Si, Al, Fe, Mg, AND Ca IN THE FINE FRACTIONS OF SOME CZECH AND SLOVAK BENTONITES

Rok, strany: 1992, 3 - 7

Phase composition of the <2 µm fractions of eleven samples from nine Czech and Slovak bentonite deposits were studied by X-ray diffraction, infrared spectroscopy, thermal analysis, and acid dissolution (AD) techniques. Smectite was the main phase in all samples, but only one was monomineralic. The amount of non-smectitic phases varied between 18 and 51 mass %. Readily soluble (in 6M HCl at 95°C) and insoluble components were found in all samples. Exchangeable calcium and hydrated forms of aluminium and of Fe(III) oxides and hydroxides are usually the main components of readily soluble phases, but Mg as a constituent of these phases cannot be excluded. Crystalline phases (kaolinite, anatase, cristobalite), a partly weathered hydrated volcanic glass and SiO₂ from smectite tetrahedra are expected in the insoluble components. Acid dissolution enables the calculation of reasonable structural formulas of smectites containing extraneous phases.

ISO 690:

Cicel, B., Komadel, P., Bednarikova, E., Madejova, J. 1992. MINERALOGICAL COMPOSITION AND DISTRIBUTION OF Si, Al, Fe, Mg, AND Ca IN THE FINE FRACTIONS OF SOME CZECH AND SLOVAK BENTONITES. In Geologica Carpathica Clays, vol. 1, no.1, pp. 3-7.

APA:

Cicel, B., Komadel, P., Bednarikova, E., Madejova, J. (1992). MINERALOGICAL COMPOSITION AND DISTRIBUTION OF Si, Al, Fe, Mg, AND Ca IN THE FINE FRACTIONS OF SOME CZECH AND SLOVAK BENTONITES. Geologica Carpathica Clays, 1(1), 3-7.