Zanzibar and Indian Ocean trade in the first millennium CE: the glass bead evidence

@article{Wood2016ZanzibarAI,
  title={Zanzibar and Indian Ocean trade in the first millennium CE: the glass bead evidence},
  author={Marilee Wood and Serena Panighello and Emilio F Orsega and Peter Robertshaw and Johannes T. van Elteren and Alison Crowther and Mark C. Horton and Nicole Boivin},
  journal={Archaeological and Anthropological Sciences},
  year={2016},
  volume={9},
  pages={879-901}
}
Recent archaeological excavations at the seventh- to tenth-century CE sites of Unguja Ukuu and Fukuchani on Zanzibar Island have produced large numbers of glass beads that shed new light on the island’s early interactions with the wider Indian Ocean world. A selected sample of the beads recovered was analyzed by laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) to determine the origins of the glass used to make the beads and potential trade relationships are considered… 
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TLDR
Comparisons with contemporary v-Na-Al glass vessels and beads from Central Asia, Africa, and southeast Asia show that most of the Malindi and Mambrui glass share similar characteristics to the compositions of Mapungubwe Oblate and some of the Madagascar glass beads from southern Africa.
On-Site Raman Spectroscopic Study of Beads from the Necropolis of Vohemar, Northern Madagascar (>13th C.)
In the late 19th century, ancient tombs were discovered near the village of Vohemar at the northeastern point of Madagascar, and subsequent excavations during the French period (1896–1945) revealed
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