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'China stone' is a medium grained, feldspar-rich partially decomposed granite. 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 and is the UK’s only indigenous source of feldspathic material currently being commercially extracted.
Other names include Cornish or Cornwall stone. It is sometimes confused with petunse, which although somewhat similar, is a different rock.