Record details

    Stone of a Gothic Pieta from Torun (Poland)
Statement of responsibility
    Josef Šrámek
Other titles
    15th Conference on Clay Mineralogy and Petrology, Brno, September 6-10, 1998 - Proceedings (Variant.)
    Šrámek, Josef
Source title - serial
    Scripta facultatis scientiarum naturalium Universitatis Masarykianae brunensis. Geology
    Vol. 28-29
    p. 99-108
    1 obr., 5 fot., 2 tab.
    Obsahuje bibliografické odkazy
    Zkr. název ser.: Scr. Univ. Masaryk. brun., Geol.
Subject group
    chemismus hornin
    česká křídová pánev
    kámen dekorační
    minerály jílové
    vltavo-berounský faciální vývoj
Geographical name
    Praha-Přední Kopanina
    Toruň (Polsko)
Abstract (in english)
   A comparative microscopical, chemical, and porosimetrical studies confirmed that stone of a Gothic Pieta dated back to the second half of 14th or the beginning of the 15th century, coming from Nowe Miasto Lubawskie now stored in Toruň (Poland), is identical with a Prague's opuka "Plänerkalk" - spongilite or marly chert. This rock consists of about 47% fine globules of poorly crystallized quartz, 30% micritic calcite with a few foraminifer tests and 20-25% clay minerals (kaolinite, illite and mixed-layer illite - smectite and scarce glauconite) with a small admixture of feldspars, pyrite and fine sandy - silty quartz grains. The stone was quarried on the outskirts of Medieval Prague in quarries of the area of Strahov - Bílá hora, which are not at present time accessible. Thus a provenance identification can only be carried out with stones from an active quarry near the village Přední Kopanina, about 10-15 km westward of the mentioned Medieval quarries.
   There is 1,2 m thick bed at the bottom of a profile called "golden/red" or "white" opuka, which could be used for this comparison. Although the yellowish color, texture and macroscopic appearance, chemical composition and physical parameters are very similar to the stone from the layer called "golden/red" opuka, the results of mercury porosimetry show almost an identical resemblance with the "white" variety of opuka, forming a bottom of Turonian marly cherts. All data about mineralogy, chemical composition, physical and mercury porosimetry collected by Konta (1993), Scholle, Konta (1987) and the present author (Šrámek, 1997, 1998; Šrámek et al., 1992) can be used for future revisions of insufficiently identified stone of many Gothic statues in Austria or Germany
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
Entered date
    21. 3. 2008
Import date
    8. 8. 2012