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China stone : ウィキペディア英語版
China stone
China stone is a medium grained, feldspar-rich partially kaolinised granite characterized by the absence of iron-bearing minerals.〔(Cornwall County Council website, ''China clay and china stone'' ) undated, URL retrieved on 14 September 2007〕 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. Production levels in the four years up to 2003 averaged 2,800 tonnes per year.〔
Other names include Cornish or Cornwall stone.〔(Ceramic Materials Database ) undated, URL retrieved on 14 September 2007〕 It is sometimes confused with petuntse, which although somewhat similar, is a different rock.
==References==


抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
ウィキペディアで「China stone」の詳細全文を読む



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