china clay


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Related to china clay: fire clay, kaolin, Ball clay, Kaolin clay

china clay,

one of the purest of the clays, composed chiefly of the mineral kaolinitekaolinite
, clay mineral crystallizing in the monoclinic system and forming the chief constituent of china clay and kaolin. It is a hydrous aluminum silicate commonly formed by the weathering and decomposition of rocks containing aluminum silicate compounds; feldspar is a chief
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 usually formed when granite is changed by hydrothermal metamorphismmetamorphism,
in geology, process of change in the structure, texture, or composition of rocks caused by agents of heat, deforming pressure, shearing stress, hot, chemically active fluids, or a combination of these, acting while the rock being changed remains essentially in the
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. Usage of the terms china clay and kaolin is not well defined; sometimes they are used synonymously for a group of similar clays, and sometimes kaolin refers to those obtained in the United States and china clay to those that are imported. Some authorities term as china clays the more plastic of the kaolins. China clays have long been used in the ceramic industry, especially in fine porcelains, because they can be easily molded, have a fine texture, and are white when fired. France's clays are made into the famous Sèvres (see A. BrongniartBrongniart, Alexandre
, 1770–1847, French geologist, mineralogist, and chemist. As director of the Sèvres porcelain factory from 1800, he was responsible for its international fame.
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) and Limoges potteries. These clays are also used as a filler in making paper. In the United States, deposits are found primarily in Georgia, North Carolina, and Pennsylvania; china clay is also mined in England (Cornwall) and France.

china clay

[′chī·nə ‚klā]
(materials)
A high-grade white kaolin composed principally of the mineral kaolinite, and often occurring as a lenticular-shaped body; used in the manufacture of ceramics, paper, rubber, catalysts, and ink.
References in periodicals archive ?
Members of the Glamorgan Constabulary in Cornwall during the 1913 china clay strike PICTURE: Wheal Martyn China Clay Museum
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It is a wonderful addition within a unique landscape, and a fitting memorial to the 300th anniversary of the man who founded Cornwall's China Clay industry.
The China Clay project features ten sequential lessons on clay for kindergarten students based on Chinese history, culture, and geography.
With elementary monochrome geometrical shapes painted on the raw plywood in gestural strokes of china clay and river mud, these works are at once refined and raw.
On retiring from the Police in 1968, he joined the English China Clay Company in Plymouth as a transport supervisor for ten years.
These are Cornwall's china clay pits, an age-old industry that
NIGEL POPE, a china clay refiner from St Austell, Cornwall, has won a Shakespeare de-luxe rod pod in our fair-for-all prize draw.
The new products include Tom Kitten alcohol-free cologne and 2-in-1 baby wash and shampoo in addition to La Source At-Home Spa Relaxing Body Silk and China Clay mask.
The spectacular Eden Project, built in a disused Cornish china clay pit, has been shortlisted as a location for the next 007 movie.
Capt James Nolan's schooner the Loch Ryan, which was carrying china clay from England to Arklow, was bombed and machine-gunned by the Luftwaffe off Cornwall on August 16, 1940.

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