From archived post: (Evelyn, 04/09/2005) located at:

http://www.beadcollector.com/openforum/posts/27647.html

vi) Two fragments of a pale-blue translucent eye bead with a dense white opaque 'eye' and slightly darker 'pupil', measuring 8 x 13 mm and a 3 mm perforation. The fragments were found in a layer of loamy sand and ash, and dated to 300 - 800 CE. Chemical properties were found to be consistent with typical Roman glass that was made with natron, its additive level of antimony suggesting Italian or Egyptian origins.

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From what small about of EDX work that I have done on these "pale-blue translucent eye bead with a dense white opaque 'eye' and slightly darker 'pupil', the ratios of antimony (Sb), cobalt (Co), and to a lesser extent copper (Cu), are more consistent with the glass whose origin is generally accepted as Fustat. Roman glasses have the same elements; however, the ratios are different; and in many cases, Roman glasses, of similar color(s), also have a lead (Pb) and tin (Sn) signatures in the EDX spectra that far overshadow those of the Fustat samples. I share Evelyn’s positon, “It is not my intention to open old feuds, or to begin new controversies.”

For those who may be interested, I have posted some articles at the following location:

http://btralabama.org/html/articles/

Thanks
Austin