Clay that is produced in close association with the late Neogene lignite beds that develop around Seto City, Aichi Prefecture, Shimagahara region, Mie Prefecture, and Tajimi City, Gifu Prefecture, as well as the Paleogene coal beds in the Joban Coalfield that straddles Fukushima Prefecture and Ibaraki Prefecture. It has been used since ancient times as a raw material for refractories and ceramics. It contains carbonized plant fragments, and its pattern resembles knots in wood, hence the name. It can be brown, dark brown, gray, dark gray, or gray-blue. It has a greasy luster and is highly adhesive and plastic. In terms of mineral composition, it is mainly composed of the clay mineral kaolinite, but may also contain halloysite and metahalloysite. Fine grains of quartz, zircon, and titanium minerals are mixed in as impurities. It is called Kurokibushi, Shirakibushi, and Amekibushi due to differences in color. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
愛知県瀬戸市周辺,三重県島ヶ原地方,岐阜県多治見市周辺などに発達する新第三紀末の亜炭層,および福島県と茨城県にまたがる常磐炭田の古第三紀の炭層などに密接に伴って産出する粘土。耐火物原料および陶磁器原料として古くから利用されている。炭化した植物の破片を含み,その模様が木の節に似ているのでこの名がある。褐,暗褐,灰,暗灰,灰青色など。脂肪光沢があり,粘着力,可塑性に富む。鉱物組成上,主として粘土鉱物のカオリナイトからなるが,ハロイサイト,メタハロイサイトを伴うこともある。不純物として,微粒の石英,ジルコン,チタン鉱物などが混ざる。色調の相違により,黒木節,白木節,飴木節などと呼ばれる。
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