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Geological Society, London, Special Publications; 2006; v. 257; p. 187-199;
DOI: 10.1144/GSL.SP.2006.257.01.15
© 2006 Geological Society of London

Glass

Pre-industrial glassmaking in the Swiss Jura: the refractory earth for the glassworks of Derrière Sairoche (ct. Bern, 1699–1714)

G. Eramo

Department of Geosciences, Mineralogy and Petrography, University of Fribourg, Chemin du Musée, 6, CH-1700, Fribourg, Switzerland giacomo.eramo{at}unifr.ch

Fragments of the melting furnace and several crucibles of the glassworks of Derrière Sairoche are compared with local raw materials. Principal component analysis (PCA) based on the chemical composition and on the grain-size distribution of the archaeological and natural materials demonstrates that the analysed samples were made from the same raw material and that local clayey sands (Hupper, Sidérolithique) were exploited. Availability in situ of good raw materials made tempering unnecessary. Their high melting point (c. 1600 °C) allowed good performance in service conditions at temperatures up to 1500 °C. Moreover, because of low Fe2O3tot concentrations, batch-glass contamination was avoided.