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IDENTYFIKACJA MARMURU UŻYTEGO W SARKOFAGU WŁADYSŁAWA JAGIEŁŁY W KATEDRZE WAWELSKIEJ

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Bromowicz J., Magiera J.

Ochrona Zabytków

2006

issue 3

87-96

In an attempt to identify the marble of the tomb of King Jagiello, three kinds of marbles were used as a refernce material, i.e.: Italian Ammonitico Rosso, Austrian Roter Knollenkalk and Hungarian red. Structure, texture and mineral composition were examined and SEM-EDAX analysis was done. Very limited size of the sample available disabled the use of the optical microscope. Generally, the tomb is made of red limestone with a nodular structure and sound, non porous texture. The nodules are 1 to 5 cm in diameter. This kind of a decorative limestone being succeptible to carving and polishing is traditionally called a 'marble'. Four varieties were identified in the tomb: Variety 1. Colour is red-brownish, nodules are slightly lighter than a matrix. Indistinct parallel bedding, stylolites and ammonites can also be seen. Variety 2. Generally, red-brownish in colouring, with stronger contrast between nodules (yellow-pinkish) and matrix (brown-reddish). Variety 3. Dark red-brownish. Nodules do not contrast strongly from the matrix. Variety 4. Colour is intermediate between varieties 1 and 2. Structure, texture and colour point to the Ammonitico Rosso marble as a stone applied in the tomb. Size, shape and colour of the nodules as well as colouring of the matrix make it similar to a variety that occurs in the vicinity of Verona and is called Rosso di Verona. Hungarian marbles obviously differ from that used in the tomb. Their colouring is generally darker and more brownish. Nodules are less pronounced and less contrasted from the matrix. SEM and SEM-EDAX analyses did not appear particularly diagnostic. The sample from the tomb was generally more fine grained than the reference samples thus disabling comparison of further structural and textural features. However, similarities were detected between the tomb marble and the Rosso di Verona marble, e.g. in the texture and number of genarations of the micrite, presence of clay minerals and iron oxides. Noticeable is a presence of Al, Si and K in the tomb marble, being apparently connected with clay minerals and with products of chemical weathering. All this point to the Rosso di Verona as the most probable stone applied in the tomb. Chemical composition of the marbles form the Verona area is following: Si - 5.90% CaO - 51.31% MgO - 0.14% CO2 - 40.48% Fe2O3 - 0.66 % FeO - traces Al2O3 - 0.84% Mn - traces Average porosity is less than 0.5%, and water sorption is less than 0.1% (W. D. Grimm, R. Snethlage, 1984).

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1 Ochrona Zabytków

1 Bromowicz J.

1 Magiera J.

1 2006

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IDENTYFIKACJA MARMURU UŻYTEGO W SARKOFAGU WŁADYSŁAWA JAGIEŁŁY W KATEDRZE WAWELSKIEJ