finely pulverized gypsum used especially as a pigment
fine white clay used in making tobacco pipes and pottery and in whitening leather
同义词：pipeclay
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)
同义词：china clay, china stone, kaolin, kaoline, porcelain clay
