Chemical and Oxygen Isotopic Composition of Roman and Late Antique Glass from Northern Greece

Figure 3

Na₂O versus SiO₂ (a), MgO versus K₂O (b), Al₂O₃ versus CaO (c), and MnO versus FeO (d) contents of Greek glass samples, subdivided by provenance: Thessaloniki Agora (⋄), Maroneia (○), Thessaloniki, various sites (∆: natron glass; ▲: soda ash glass). Mean chemical compositions and standard deviations of main compositional natron groups, identified in literature and comparable with Greek samples, are also shown: “Roman” glass (bold plus sign), Group 2 (bold multiplication sign) [22, 35].

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(b)

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(d)