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d’archéologie orientale - Le Caire

Verre byzantin et islamiqueByzantine and Islamic Glass

Maria Mossakowska-Gaubert

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Poids en verre, fouilles de Fusṭāṭ (© IFAO)Glass weight, Fusṭāṭ excavations (© IFAO)
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FREESTONE, Ian C. ; LESLIE, Karen A. ; THIRLWALL, Matthew ; GORIN-ROSEN, Yael
Strontium Isotopes in the Investigation of Early Glass Production: Byzantine and Early Islamic Glass from the Near East
Archaeometry 45/1
University of Oxford, 2003, p. 19-32
http://onlinelibrary.wiley.com/journal/10.1111/%28ISSN%291475-4754/issues

[501, 1300]
• Preliminary remarks:
– 87Sr/86Sr ratios determined for glasses from four production sites, dated between the 6th and the 11th centuries: Bet Sheʿarim, Bet Eliʿezer, Banias, Ashmunein.
– Majority of the samples were chunks of raw glass.

• Chemical analyses: 87Sr/86Sr, Sr, SiO2, TiO2, Al2O3, FeO, MnO, MgO, CaO, Na2O, K2O, P2O5, Cl, SO3.

– Bet Eliʿezer:
primary glass workshop (byzantine - early islamic period): natron glass - glass low in magnesia, high in silica and low in soda [compositional group ‘Levantine II’ cf. Freestone, Greenwood, Gorin-Rosen 2002].
- marine shell-derived strontium (from the costal sand): 87Sr/86Sr ratios close to 0.7090 and high elemental strontium.

– Bet Sheʿarim:
- secondary glass workshop (6th-7th centuries A.D.): natron glass - low in magnesia, compositional group ‘Levantine I’ made using the Belus sand sources, or similar sand from the Levantine coast;
- marine shell-derived strontium (from the costal sand): 87Sr/86Sr ratios close to 0.7090 and high elemental strontium.

– Ashmunein:
- secondary and primary (?) glass workshop (8th-9th centuries A.D.): natron glass - low in magnesia, high in lime, low in alumina, compositional group ‘Egypt II’.
- limestone-derived strontium (from the inland sand): 87Sr/86Sr ratios close to 0.70794–0.70798 and low elemental strontium.

– Banias:
- primary glass workshop (between the 10th/11th and 13th centuries A.D.): plant-ash glass: high in magnesia, high in potash.
- limestone-derived stronium (from soils parental to the plants that were ashed to make the glass): 87Sr/86Sr ratios close to 0.70772–0.70780 and high elemental strontium.

• Stronium and its isotopes offer an approach to identifying both the raw materials and the origins of ancient glasses.

Version 5, données dudata date 30 janvier 2013January 30th 2013