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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).
Hexagonal sheets of the clay mineral kaolinite (SEM image, 1,340× magnification) Clay is a very fine-grained geologic material that develops plasticity when wet, but becomes hard, brittle and non–plastic upon drying or firing. [2] [3] [4] It is a very common material, [5] and is the oldest known ceramic.
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 .
Ball clays are kaolinitic sedimentary clays that commonly consist of 20–80% kaolinite, 10–25% mica and 6–65% quartz, along with small amounts of organic matter (such as lignite) and trace amounts of other minerals such as pyrite and siderite.
Metakaolin can be produced from a variety of primary and secondary sources containing kaolinite:Metakaolin is a dehydrated form of kaolinite, a type of clay mineral. Kaolinite-rich minerals are also referred to as china clay or kaolin, which are traditionally utilized in the production of porcelain.
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The clay paint is statistically more reactive than the clay plaster because it contains cellulose and alcohol esters, two components who reacts with ozone. Reaction probabilities of clay plaster are due to its major component, kaolinite. Kaolinite is a hydrous aluminosilicate mineral that comprises 50% of the clay plaster.