Pyroxene inclusions in paleo-Christian mosaic tesserae: a new tool for constraining the glass manufacturing temperature |
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| Authors: | Tonietto Serena Nestola Fabrizio Redhammer Gunther J Silvestri Alberta Molin Gianmario Bruno Marco |
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| Institution: | 1.Dipartimento di Geoscienze, Università di Padova, Via Giotto 1, 35137, Padova, Italy
;2.Abteilung für Mineralogie, Fachbereich Materialwissenschaften & Physik, Universität Salzburg, Hellbrunnerstrasse 34, 5020, Salzburg, Austria
;3.Dipartimento di Scienze Mineralogiche e Petrologiche, Università di Torino, Via Valperga Caluso 35, 10125, Torino, Italy
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| Abstract: | The mineral inclusions of two orange glass tesserae from paleo-Christian mosaics were investigated in order to derive the
melting temperature reached during their production (sourced from Padua and Vicenza, Veneto region, Italy). In particular,
clinopyroxene crystals were studied by single-crystal X-ray diffraction and electron microprobe WDS analysis. The crystals
show C2/c symmetry, typical of disordered Ca/Na and Mg/Al distributions indicating high-temperature of formation (>700°C). The cation
site populations were obtained by combining results from the two experimental techniques enabled us to derive the following
stoichiometric formula:
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lM2Ca0.819Na0.172Mn0.006K0.003]M1Mg0.765Fe3+0.210 Cu0.015Ti0.006Zn0.006]TSi1.933Al0.037Sn0.024]O6\begin{array}{l}{}^{M2}\mathrm{Ca}_{0.819}\mathrm{Na}_{0.172}\mathrm{Mn}_{0.006}\mathrm{K}_{0.003}]{}^{M1}\mathrm{Mg}_{0.765}\mathrm{Fe}^{3+}_{0.210}\\3pt]\quad{}\mathrm{Cu}_{0.015}\mathrm{Ti}_{0.006}\mathrm{Zn}_{0.006}]{}^{T}\mathrm{Si}_{1.933}\mathrm{Al}_{0.037}\mathrm{Sn}_{0.024}]\mathrm{O}_{6}\end{array} |
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