fritware

The twelfth and thirteenth centuries constitute a high point in the history of Islamic ceramics, with finely potted and decorated fritwares produced in both Syria and Iran.

Akin to European soft-paste porcelain, this material, known as fritware or stone-paste, is described in the fourtheenth-century treatise of Ahu'l Qasim as consisting of ten parts ground quartz, one part ground glass and one part fine white clay.