porcelain clay

from the GNU version of the Collaborative International Dictionary of English

• n. a very pure variety, formed directly from the decomposition of feldspar, and often called kaolin.
• n. See under Clay.

from The Century Dictionary and Cyclopedia

• n. Kaolin.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• n. a fine usually white clay formed by the weathering of aluminous minerals (as feldspar); used in ceramics and as an absorbent and as a filler (e.g., in paper)