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Main Colouring Minerals in the ‘Poznań Clays’: Case Studies from the Upper Neogene in the Polish Lowlands

Klęsk Jakub, Błachowski Artur, Kruszewski Łukasz, Kubiak Michał, Widera Marek

Inżynieria Mineralna

2024

Vol. 1, no. 1

145--152

This article is devoted exclusively to three iron minerals that have a decisive influence on the colour of the ‘Poznań Clays’. These are hematite, goethite, and jarosite. Their presence gives the ‘Poznań Clays’, which are the most common and best known Neogene lithostratigraphic unit in the Polish Lowlands, characteristic ‘warm’ colours ranging from yellow through orange to dark red. The presented results were mainly obtained using powder X-ray diffraction and 57Fe Mössbauer spectroscopy.