paper clay

noun2

1. •
   Clay mixed with shredded paper or other fibres, valued for its strength and light weight in the production of large ceramic works.

   • Ceramic paperclay contains a special balance of organic cellulose fibers (like those in recycled paper pulp) dispersed uniformly within a base of inorganic traditional clay. — 1993
2. •
   Synonym of kaolin; also similarly uniform light-coloured clay composed of fine particles.

   • It is a good specimen of the variety of fire-clay, which is used for facing paperhangings, and is sold as paper clay. — 1840