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
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