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 ?
For the treatment of wastewater samples, the required dosages of the adsorbent (natural material like Bentonite, Fuller's earth, China clay and Zeolite) was added to wastewater sample, stirred well (agitator speed: 400 rpm) and kept in contact for desired contact duration and at the temperature under investigation and then filtered.
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.
For instance, when the china clay industry bolstered the economy, it did so at the expense of the environment.
China clay is a product of the decomposition of granite in the open weathered joints in which it is dispersed.
It is mentioned that Pakistan has abundance of economically exploitable reserves of coal, rock salt, limestone and onyx marble, China clay, dolomite, fire clay, gypsum, silica sand and granite as well as precious and semiprecious stones.
Eden transformed a 160-year-old exhausted china clay quarry near St Austell into an abundant garden with rainforest and Mediterranean biomes, and was established as one of the Landmark Millennium Projects to mark the year 2000 in the UK.
Pennon has developed two disused china clay pits, known as Park and Stannon Lakes, in Cornwall as it looks to secure water supply for the south west region.
They were built to shift the products of Cornish china clay pits to the docks for onward shipment by sea, their height being exactly the same as the china clay wagons they pulled.
The report includes chapters on survey method and sources, resources, mining, quarrying, china clay, turf, other uses and activities, agriculture, industrial settlement and public amenities, transport and communications, and recommendations for further work.
A rarer form of dump is one that contains a sulphide figure made of china clay.
Now the time had come for the next transformation: paper had to be incorporated into china clay.
Cornwall in general, and Bodmin Moor specifically, (which is where she is now located), have been and remain important for china clay and slate mining.

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