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Islamic stone-paste, also called fritware and quartz frit, is a ceramic material which seems to have been first manufactured in Iraq in the 9th century. Egypt was the main center of manufacture between the 10th and the 12th century, but it then spread throughout the Middle-East until modern times.
A glaze, processed at a higher temperature, was then applied on the surface to harden the object.
- Archaeological chemistry by Zvi Goffer p.254 
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