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  2. Clay County School District (North Carolina) - Wikipedia

    en.wikipedia.org/wiki/Clay_County_School...

    In the 1970s, students in the high school carpentry-masonry class built homes which were sold and also constructed the Clay County jail. [9] Hayesville Middle School was created in 1989. Until that time, Hayesville Elementary served kindergarten through 6th grade and Hayesville High School served 7th grade through 12th grade.

  3. Expanded clay aggregate - Wikipedia

    en.wikipedia.org/wiki/Expanded_clay_aggregate

    Lightweight expanded clay aggregate (LECA) or expanded clay (exclay) is a lightweight aggregate made by heating clay to around 1,200 °C (2,190 °F) in a rotary kiln. The heating process causes gases trapped in the clay to expand, forming thousands of small bubbles and giving the material a porous structure. LECA has an approximately round or ...

  4. Ball clay - Wikipedia

    en.wikipedia.org/wiki/Ball_clay

    Ball clay. 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. They are a common raw material for various types of ceramics, where their primary ...

  5. Limestone Calcined Clay Cement - Wikipedia

    en.wikipedia.org/wiki/Limestone_Calcined_Clay_Cement

    The main components of LC3 cements are clinker, calcined clay, limestone, and gypsum. [24] [25] [26] The fresh concrete production involves synergetic hydration.[10] [27] Adding large amounts of calcined clay and ground limestone to the dry cement powder, [28] [29] when adding water to the mix for making concrete, cement and additives start to hydrate and the soluble aluminates released in ...

  6. Clay - Wikipedia

    en.wikipedia.org/wiki/Clay

    A Quaternary clay deposit in Estonia, laid down about 400,000 years ago. 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 ...

  7. Montmorillonite - Wikipedia

    en.wikipedia.org/wiki/Montmorillonite

    Montmorillonite, a member of the smectite group, is a 2:1 clay, meaning that it has two tetrahedral sheets of silica sandwiching a central octahedral sheet of alumina. The particles are plate-shaped with an average diameter around 1 μm and a thickness of 0.96 nm ; magnification of about 25,000 times, using an electron microscope, is required ...

  8. 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]

  9. Thacker Pass lithium mine - Wikipedia

    en.wikipedia.org/wiki/Thacker_Pass_Lithium_Mine

    The Thacker Pass lithium mine is a lithium clay mining development project in Humboldt County, Nevada, which is the largest known lithium deposit in the US and one of the largest in the world. [5] [6] [7] There has been significant exploration of Thacker Pass since 2007.

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