There are 16 terms currently used in industrial circle - china clay or kaolin, ball clay, fire clay, sodium bentonite, calcium bentonite or pascalite, attapulgite or fuller's earth, brick clay, stoneware clay, pipe clay, roofing tile clay, pottery clay, terracotta clay, terracotta clay shale, brick-making clay shale, flint clay and pozzolanic clay.
The original name 'kaolin' also owes its name to a Chinese word "kauling" meaning high ridge - the name of a hill where it was first mined.
, some kaolins)
(a) Kaolin - white in colour, usually white burning.
Low strength, e.g. residual kaolins such as those from North Carolina
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