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Mineralogical and geochemical characterization of high-medieval lead–silver smelting slags from Wiesloch near Heidelberg (Germany)—an approach to process reconstruction

Ströbele, Florian
Wenzel, Thomas
Kronz, Andreas
Hildebrandt, Ludwig H.
Markl, Gregor
Journal: Archaeological and Anthropological Sciences; 23; 2010; p. 191 - 215
DOI: https://doi.org/10.1007/s12520-010-0039-7
Ströbele, Florian; Wenzel, Thomas; Kronz, Andreas; Hildebrandt, Ludwig H.; Markl, Gregor, 2010: Mineralogical and geochemical characterization of high-medieval lead–silver smelting slags from Wiesloch near Heidelberg (Germany)—an approach to process reconstruction. In: Ströbele, Florian; Wenzel, Thomas; Kronz, Andreas; Hildebrandt, Ludwig H.; Markl, Gregor (2010): Mineralogical and geochemical characterization of high-medieval lead–silver smelting slags from Wiesloch near Heidelberg (Germany)—an approach to process reconstruction - Archaeological and Anthropological Sciences, Vol. 2, Nr. 3, p. 191-215, 191 - 215, DOI 10.1007/s12520-010-0039-7.
 
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  • Abstract
Here, we present detailed electron microprobe analyses and age data of high-medieval lead–silver smelting slags. The mineral composition data provide a database of all silicate and oxide phases in the slag. Bulk chemistry as well as mineral composition is used to reconstruct liquidus, solidus, and viscosity of the slag melt. By calculating the mass balance of the smelting process, a mass ratio of the various compounds used in the smelting process is determined. Through this we were able to discriminate qualitatively between non-ferrous metal smelting slags and bloomery slags. We also report a new type and process of silver production in which argentiferous galmei (zinc carbonate) was used as a main silver ore together with galena. The results indicate a sophisticated high-medieval smelting technology, in which a slag with a low liquidus and a low viscosity was created.
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