White bole

Kaolin, China clay, terra alba, argille, porcelain clay, and white bole are the generic names used to refer to primary clays that include three distinct white minerals - kaolinite, nacrite, and dickite - all of which share a very similar composition but differ slightly in their structure. Kaolin is rarely found pure, but as a natural mixture with other varieties of clay together, the various clays make up over 95% of the total weight of the mixture, other earthy... 

The Chemical Dictionary defines porcelain as "ceramic wear made largely of baked clay (kaolin) coated or glazed with a fusible substance." Kaolin is defined as "(china clay white bole argilla porcelain clay white clay). A whiteburning clay, which, due to its great purity, has a high fusion point and is the most refractory of all clays." It gives the composition as "mainly kaolinite (40% alumina, 55% silica) plus impurities and water."... 

Argilla bolus alba China clay E559 kaolinite Lion porcelain clay Sim 90 weisserton white bole. 

Kaolin. Bolus alba China clay porcelain clay white bole argilla. Essentially a hydrated aluminum silicate, approximately HIAl1Si]0,.H20. Prepare) for pharmaceutical and medicinal purposes by levigating with water to remove sand, etc. 

See also ARMENIAN BOLE, RED BOLE and WHITE BOLE... 

Kaolin, Hydrated Aluminum Silicate, China A Clay, Pipe Clay, and White Bole. 

White Bole (bolus alba) A Syn Kaolin. See Aluminum Silicate. 

The serpentine form of asbestos, known as chrysotile, is mined chiefly in Canada and the former Soviet Union more than 90% of the asbestos used in the United States is in this form. The amphi-bole crocidolite is mined in small quantities, mainly in South Africa. The two minerals differ greatly in composition, color, shape, solubility, and persistence in human tissue. Crocidolite is blue, relatively insoluble, and persists in tissue. Its fibers are long, thin, and straight and they penetrate narrow lung passages. In contrast, chrysotile is white, and it tends to be soluble and disappear in tissue. Its fibers are curly they ball up like yarn and are more easily rejected by the body. Scientific studies of many types and by groups in many countries have shown that chrysotile asbestos is significantly less of a health hazard than other types. It is important to note that almost all manufactured materials in the United States contain only this form of asbestos. 

Bole n. Name frequently given in the arts to clay, either white or colored. 

Bole is either a naturally occurring or iron-rich material (such as red ochre q.v) particularly suited to applications such as substrates for gilding where a high surface polish is required. Documentary sources mention various colours such as white and red boles. Harley (1982) found among seventeenth century British documentary sources that the term bole appeared occasionally as a synonym for red ochre, but that it was more typically associated with Armenian bole - bole Armoniack - and, according to de Mayeme (BL MS Sloane 2052), in canvas priming. Merrifield (1849) lists bularminium as synonymous. 

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