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New data on “kerolite–pimelite” series and the colouring agent of Szklary chrysoprase, Poland
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SYSNO ASEP 0463700 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title New data on “kerolite–pimelite” series and the colouring agent of Szklary chrysoprase, Poland Author(s) Čermáková, Zdeňka (UACH-T) SAI
Hradil, David (UACH-T) RID, SAI
Bezdička, Petr (UACH-T) SAI, RID, ORCID
Hradilová, J. (CZ)Source Title Physics and Chemistry of Minerals. - : Springer - ISSN 0342-1791
Roč. 44, č. 3 (2017), s. 193-202Number of pages 10 s. Language eng - English Country DE - Germany Keywords Pimelite ; Colourant ; Interlayer water ; Chrysoprase ; X-ray diffraction ; Thermal analysis Subject RIV DB - Geology ; Mineralogy OECD category Mineralogy R&D Projects GA14-22984S GA ČR - Czech Science Foundation (CSF) Institutional support UACH-T - RVO:61388980 UT WOS 000396046400004 EID SCOPUS 84990855379 DOI 10.1007/s00269-016-0848-z Annotation Green clay and chrysoprase samples from the Ni-laterite deposit in Szklary, Poland, were studied by X-ray diffraction (XRD), electron microprobe analysis (EMPA), Raman, infrared and UV–VIS–NIR absorption spectroscopies. The clay samples proved to be Ni-rich “kerolite” and “pimelite”, and as these minerals are currently discredited, their nature was studied in more detail by high-temperature X-ray diffraction and thermal analysis coupled with mass spectrometry. These methods showed that “kerolite” and “pimelite” contain interlayer water, i.e. they differ from the non-hydrated talc–willemseite mineral series. Subsequently, the XRD and EMPA analyses of Szklary chrysoprase indicated that chrysoprase’s colouring agent is “pimelite”, which was further corroborated by Raman and UV–VIS–NIR spectroscopies. In addition, the Szklary chrysoprase, which has been quarried since the Middle Ages and used in jewellery and wall decorations (e.g. in the Prague Cathedral), was described from the gemmological point of view. Workplace Institute of Inorganic Chemistry Contact Jana Kroneislová, krone@iic.cas.cz, Tel.: 311 236 931 Year of Publishing 2017
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