stone paste

noun2

1. •
   Fritware.

   • Islamic stone paste, also known as frit ware and quartz frit, is a characteristic type of pottery that seems to have been first made in Iraq during the ninth century C.E. — 2006
2. •
   A mixture of clay and frit used to create ceramics.

   • Later tiles were made from a compound called “stone-paste”—a mixture of ground quartz, glaze frit, and white clay. — 2009