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Kaolinite (/ ˈ k eɪ. ə l ə ˌ n aɪ t,-l ɪ-/ KAY-ə-lə-nyte, -lih-; also called kaolin) [5] [6] [7] is a clay mineral, with the chemical composition Al 2 Si 2 O 5 4.It is a layered silicate mineral, with one tetrahedral sheet of silica (SiO 4) linked through oxygen atoms to one octahedral sheet of alumina (AlO 6).
Clay is a type of fine-grained natural soil material containing clay minerals [1] (hydrous aluminium phyllosilicates, e.g. kaolinite, Al 2 Si 2 O 5 4). Most pure clay minerals are white or light-coloured, but natural clays show a variety of colours from impurities, such as a reddish or brownish colour from small amounts of iron oxide. [2] [3]
It was composed of white clay containing powdered feldspar, calcium phosphate and wollastonite (CaSiO 3 ), with quartz . [ 10 ] [ 11 ] Other early European soft-paste porcelain, also a frit porcelain, was produced at the Rouen manufactory in 1673, which was known for this reason as "Porcelaine française". [ 12 ]
Olla – a ceramic jar, often unglazed, used for cooking stews or soups, for the storage of water or dry foods, or for other purposes. Pipkin – an earthenware cooking pot used for cooking over direct heat from coals or a wood fire. Palayok – a clay pot used as the traditional food preparation container in the Philippines used for cooking ...
Cooking in unglazed clay pots which are first immersed in water dates at least to the Etruscans in first century BC but likely dates to several centuries earlier. [1] The Romans adapted the technique and the cooking vessel, which became known as the Roman pot, a cooking vessel similar to those made since April 1967 by the German company Römertopf.
Other uses include as an anticaking agent in animal feed, in papermaking to minimize deposit formation, and as a retention and drainage aid component. Montmorillonite has also been used in cosmetics. [8] Sodium montmorillonite is also used as the base of some cat litter products, due to its adsorbent and clumping properties. [citation needed]
Medicinal clay is typically available in health food stores as a dry powder, or in jars in its liquid hydrated state – which is convenient for internal use. For external use, the clay may be added to the bath, or prepared in wet packs or poultices for application to specific parts of the body.
In Central Java and East Java, Indonesia a food made of soil called ampo is eaten as a snack or light meal. [36] [37] [38] It consists of pure clay, without any mixture of ingredients. [36] Bentonite clay is available worldwide as a digestive aid; kaolin is also widely used as a digestive aid and as the base for some medicines.