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G3 2

Late medieval gourd-shaped glass vessels are frequently found in archaeological excavations in Portugal.This type of glass shaped objects is not common in European finds, raising the possibility of a local Portuguese production. Glass material analysis using PIXE and LA-ICP-MS techniques was performed in order to identify the raw materials used and production techniques employed and to provide composition data which then allowed comparison with coeval glass objects produced in known European centres. Although the glass composition of one of these gourds is compatible with that of a Venetian glass, most of the remaining glass fragments present an high alumina content. This high content had previously been reported for other coeval Portuguese glass finds and then proposed to be the result of two yet unknown Portuguese production centres. This reinforcs the possibility of a National production of the gourd-shaped glass vessels