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Foreign musicians on camel. Sancai glaze. 723 CE Sancai wares were made in north China using white and buff-firing secondary kaolins and fire clays.Wood, Nigel (1999).
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Sancai means "three-colours": green, yellow and a creamy white, all in lead-based glazes. In fact some other colours could be used, including cobalt blue. In the West, Tang sancai wares were sometimes referred to as egg- and-spinach. Sancai wares were northern wares made using white and buff-firing secondary kaolins and fire clays.
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Occurrence of gibbsite is always associated with these well-ordered kaolinites. Normally occurrence of hyper-aluminous clays due to the existence of gibbsite is one of the interesting subjects in the history of these kaolins. This causes many discussions about the origin of this mineral. The existence of gibbsite has been mentioned in the studies of Languine and Halm (1951), Caillere and Jourdain (1956), Kulbickie (1956), Dubreuilh et al.
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This type of sand can have some influences on the leaching by mineral and organic acids produced by pyrite and organic materials, of the lower kaolin deposits. Thiry has found that generally these kaolins contain rather well- ordered kaolinite. Obviously, the level of crystallization can control technical properties of kaolinite as well as the structural impurities. The high energy current can interrupt the continuity of the settled layers of kaolin and reduce the simplicity of the estimation methods.
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The pottery clays found in the Japanese archipelago range from fusible earthenwares to refractory kaolins. From the Jōmon period to the Yayoi period, Japanese potters relied on high plastic iron-bearing shale and alluvial clays. Organic materials appear in much of the early Jōmon period work, but sand or crushed stone predominates thereafter. Further refinements came about under the Chinese influence in the 8th and 9th centuries AD, when creators of Nara three-color wares and Heian ash glazed wares sought out white, refractory clays and enhanced their fineness through levigation.
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Ghanaian mineral resources: bauxite from Nyinahin in Ashanti; diamond from Akwatia in Eastern region; timber from Ashanti forest and manganese from Konongo in Ashanti Export earnings from minerals averaged 35%, and the sector is one of the largest contributors to Government revenues through the payment of mineral royalties, employee income taxes, and corporate taxes. In 2005, gold production accounted for about 95% of total mining export proceeds. The extractive mining industry of Ghana is expected to generate an annual revenue of GH₵75.7 billion (US$35 billion) in 2014 and other than industrial minerals and exports from South Ghana such as timber, diamonds, bauxite, and manganese, Ashanti Region also has a great deposit of barites; basalts; clays; dolomites; feldspars; granites; gravels; gypsums; iron ores; kaolins; laterites; limestones; magnesites; marbles; micas; phosphates; phosphorus; rocks; salts; sands; sandstones; slates; and talcs that are yet to be fully exploited and the Parliament of Ghana has no plans to nationalize Ghana's entire mining industry.
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