Jiří Konta

TL;DR: Clay has always played a major role in human life as discussed by the authors, mainly because of their wide-ranging properties, high resistance to atmospheric conditions, geochemical purity, easy access to their deposits near the earth's surface and low price.

TL;DR: In this article, the authors proposed a new strategy for clays that has to respect distinct quality requirements of different users and manufactured products, and simplification of sampling and analytical strategy is required.

TL;DR: A comparative petrographical, mineralogical and chemical study using polarizing microscope and X-ray diffraction analysis for the original samples and their insoluble residues, scanning electron microscopy (SCM) for the insoluble residue and neutron activation analysis for 30 minor and trace elements, confirms that the Pieta statue, dating from the beginning of the 15th century and recently discovered in Bern, is identical with the ‘Golden Planer’ marly chert from Prague as discussed by the authors.

TL;DR: In this article, the textural and material composition of the arkoses from the classical region in Auvergne and the graywackes from the classic region in Harz are systematically divided according to the modern classification rules for sedimentary rocks.

TL;DR: The work in this country deals with the mineralogy, petrology, and geology of argillaceous rocks, the chemical composition and physical properties of clay materials which are useful for the purposes of the ceramic, glass, chemical, construction-engineering and mining industries as discussed by the authors.