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Iron-bearing phases affecting the colour of upper Neogene clayey sediments from Dymaczewo Stare, west-central Poland

Klęsk Jakub, Błachowski Artur, Diduszko Ryszard, Kruszewski Łukasz, Widera Marek

Geologos

2022

Vol. 28, No. 2

129--139

The present paper investigates the colour dependence of mineral compositions in clay-rich sedimentary strata, mainly clayey silts, the emphasis being on iron-bearing minerals (rather than clay minerals) by using powder X-ray diffraction (PXRD) and 57Fe Mössbauer spectroscopy (57Fe-MS). The PXRD-based phase analysis has demonstrated the variable compositions of samples, consisting of, inter alia, quartz, calcite or gypsum, and admixtures of potassium feldspars and plagioclase. Hematite + goethite (sample D1, dark red), goethite (sample D2, pinkish brown), poorly crystalline goethite (sample D3, orange) and jarosite (sample D4, yellow) have been distinguished. A very low jarosite content was detected in sample D5 (light grey); this did not affect its colour. The potential yellow/brown shades in sample D6 (dark grey), coming from trace amounts of jarosite, are masked by macroscopically visible organic matter. In the case of the two last-named samples (D5 and D6), with trace amounts of Fe-bearing minerals, it is most likely that the organic matter was effective in influencing the light and dark grey colour of the sediment, respectively.

Characteristics of mechanochemical and thermal stability of selected hydroxycarbonates

Gomułczak A., Niedbała E., Rozmus M., Wieczorek-Ciurowa K.

Czasopismo Techniczne. Środowisko

2004

R. 101, z. 9-Ś

23--27

The present work described the thermal and mechanical stability of hydroxycarbonates of selected transition metals. It was shown that mechanical activation process of the studied salts brings about mechanical decomposition to oxides of different kinetics.

Prezentowana praca dotyczy termicznej i mechanicznej stabilności hydroksowęglanów wybranych metali przejściowych. Wykazano, że proces mechanicznej aktywacji badanych soli wywołuje ich rozkład do odpowiednich tlenków z różną kinetyką procesu.