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  2. Clay - Wikipedia

    en.wikipedia.org/wiki/Clay

    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 ( OH) 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.

  3. Ultisol - Wikipedia

    en.wikipedia.org/wiki/Ultisol

    Red Clay Soil. A Ultisol profile. Used in. USDA soil taxonomy. Key process. weathering. Climate. tropical, humid subtropical, oceanic. Ultisol, commonly known as red clay soil, is one of twelve soil orders in the United States Department of Agriculture soil taxonomy.

  4. Huishan clay figurine - Wikipedia

    en.wikipedia.org/wiki/Huishan_Clay_Figurine

    Huishan clay figurine ( Chinese: 惠山泥人; pinyin: Huìshān ní rén) is a traditional Chinese folk art in Wuxi, Jiangsu Province, China, with a history of more than 400 years. [1] [2] The production of Wuxi Huishan clay figurines began at the end of the Ming dynasty and developed in the Qing dynasty with specialized Huishan clay ...

  5. Clay mineral - Wikipedia

    en.wikipedia.org/wiki/Clay_mineral

    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. Prehistoric humans discovered the useful properties of clay and used it for making pottery. [6]

  6. Ceramic - Wikipedia

    en.wikipedia.org/wiki/Ceramic

    Ceramic material is an inorganic, metallic oxide, nitride, or carbide material. Some elements, such as carbon or silicon, may be considered ceramics. Ceramic materials are brittle, hard, strong in compression, and weak in shearing and tension. They withstand the chemical erosion that occurs in other materials subjected to acidic or caustic ...

  7. Expansive clay - Wikipedia

    en.wikipedia.org/wiki/Expansive_clay

    Expansive clay is a clay soil that is prone to large volume changes (swelling and shrinking) that are directly related to changes in water content. Soils with a high content of expansive minerals can form deep cracks in drier seasons or years; such soils are called vertisols.