China stone
China stone or "china clay" is a medium grained, feldspar-rich partially kaolinised granite characterized by the absence of iron-bearing minerals. It is mainly used for making porcelain, hence the name, and coatings for paper. Its discovery in the 18th century was a crucial event in the development of the English porcelain industry. Its mineral content includes quartz, feldspar and mica; accessory minerals include kaolinite and fluorspar. It is found in one area of Cornwall in the United Kingdom, near St Austell, and is the UK’s only indigenous source of feldspathic material currently being commercially extracted, by English China Clays Plc. Production levels in the four years up to 2003 averaged 2,800 tonnes per year.
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China stone
China stone or "china clay" is a medium grained, feldspar-rich partially kaolinised granite characterized by the absence of iron-bearing minerals. It is mainly used for making porcelain, hence the name, and coatings for paper. Its discovery in the 18th century was a crucial event in the development of the English porcelain industry. Its mineral content includes quartz, feldspar and mica; accessory minerals include kaolinite and fluorspar. It is found in one area of Cornwall in the United Kingdom, near St Austell, and is the UK’s only indigenous source of feldspathic material currently being commercially extracted, by English China Clays Plc. Production levels in the four years up to 2003 averaged 2,800 tonnes per year.
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China stone or "china clay" is ...... similar, is a different rock.
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China stone or "china clay" is ...... veraged 2,800 tonnes per year.
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China stone
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