Particle properties of hydrothermal ammonium-bearing illite-smectite

Authors: Šucha, Vladimír; Uhlík, Peter; Madejová, Jana; Petit, Sabine; Kraus, Ivan; Puškelová, L'ubica

Source: Clays and Clay Minerals, Volume 55, Number 1, February 2007 , pp. 36-44(9)

Publisher: The Clay Minerals Society

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Abstract:

Mixed-layer illite-smectite with high degree of ordering (rectorite-like clay) and with three types of interlayer cations - K⁺, Na⁺ and NH₄⁺, was determined in the high-sulfide epithermal mineralization of the Western Carpathian Mountains. The tobelitic portion of the clay comprises 5-10%. Ammonium was detected both by chemical analysis and by Fourier transform infrared analysis. Some of the ammonium can be assigned to a poorly bound form, not fully fixed in the illitic interlayer. The finest size fraction separated from the samples behaves differently from the rest of the sample. It contains two layers of water molecules in the expandable interlayers as determined by X-ray diffraction, whereas coarser fractions have only one water layer in the interlayers.

Keywords: AMMONIUM ILLITE-SMECTITE; CARPATHIAN MOUNTAINS; HYDROTHERMAL ACTIVITY; PARTICLE PROPERTIES; RECTORITE-LIKE MINERAL

Document Type: Research article

DOI: 10.1346/CCMN.2007.0550103

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